Firefox Sync not working on Linux Mint 17.2 Rafaela 64 bit

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brancalessio
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Posts: 97
Joined: Fri Jul 24, 2015 4:59 am

Firefox Sync not working on Linux Mint 17.2 Rafaela 64 bit

Post by brancalessio »

Hello!

I installed Linux Mint 17.2 Rafaela 64 bit few days ago and I have a problem with Firefox Sync. I just had to reinstall everything on my computer, so everything comes from a fresh install (both Linux and Windows).

I just want to sync my bookmarks.

I set Firefox Sync up with my user name and password (which are recognized), it says that the synchronization will start briefly, but it actually never starts (also after 30 minutes).

I read in some forum that this maybe due to the high number of bookmarks (I have around 2600 now...) and someone suggests to erase my Firefox Account and open it again. Nevertheless I did not try this solution, since Firefox on Windows 8.1 seems instead working.

Firefox on another installation (under Ubuntu 14.04 LTS) seems working, too. I also disconnected it and reconnected it.

I tried the following. A fresh Firefox profile (without Linux Mint customizations), but it does not work, too.

Since my home is encrypted with ecryptfs, I also tried to do the same experiment as a different user, but with a not encrypted home folder. It does not work.

I also changed my Firefox Account password to see if this was the problem, but the problem remained.

What do you suggest? Waiting for the next release of Firefox for Linux Mint, that may fix the issue, or erase and reopen my Firefox Account? Other suggestions?

Thank you for your answers!
Last edited by LockBot on Wed Dec 28, 2022 7:16 am, edited 1 time in total.
Reason: Topic automatically closed 6 months after creation. New replies are no longer allowed.
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phd21
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Posts: 10104
Joined: Thu Jan 09, 2014 9:42 pm
Location: Florida

Re: Firefox Sync not working on Linux Mint 17.2 Rafaela 64 b

Post by phd21 »

Hi brancalessio,

I'm not sure why this would be happening to your FireFox now. I don't know If Firefox has a limit to how many bookmarks it can handle, although you can search for that.

But, I can highly recommend a FireFox add-on called "xmarks", which can handle synchronizing your bookmarks and works really well. I too have a lot of bookmarks, and "Xmarks" handles it no problem. There is also another FireFox add-on called "Febe" which is great at backing up all your FireFox stuff to a folder on your system, which I then copy to an external USB flash drive and my external USB backup drive, just in case.

Note: if you have thousands of boomarks, the first time you run 'Xmarks", it will take a little time, but not afterwards ...

Hope this helps ...
Phd21: Mint 20 Cinnamon & KDE Neon 64-bit Awesome OS's, Dell Inspiron I5 7000 (7573, quad core i5-8250U ) 2 in 1 touch screen
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brancalessio
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Posts: 97
Joined: Fri Jul 24, 2015 4:59 am

Re: Firefox Sync not working on Linux Mint 17.2 Rafaela 64 b

Post by brancalessio »

Thanks for your answer!

In the mean time I made some tests and the problem is solved (so it seems). How? I don't know... It actually works with my original account on Mint.

I made several trials with several configurations. Created a new user with a clear new account on Mint, created also a totally new firefox account (with a another email address). Created also a new Firefox profile. Used the downloaded the official Firefox build (not the Mint one). It didn't work.

Yesterday I also reinstalled all the packages that contained the word "firefox" in it (among them firefox, language packs, and mint addon). It seems it was not the solution.

I also restarted Firefox disabling all addons. Again it seems it was not the solution.

A couple of info more. Every test was done with my home wifi (which in general works properly). The difference is that today I'm in a different wifi network and I tried to sync while another already synced browser (on another computer) was open.

Here is some more or less typical error logs I got running Firefox from command line (when it was not working):

Code: Select all

1438116403521	FirefoxAccounts	ERROR	error POSTing /certificate/sign: {"error":{},"errorString":"[Exception... \"NS_ERROR_NET_RESET\"  nsresult: \"0x804b0014 (NS_ERROR_NET_RESET)\"  location: \"JS frame :: resource://services-common/rest.js :: onStopRequest :: line 465\"  data: no]","message":null,"code":null,"errno":null}
1438116403521	FirefoxAccounts	ERROR	error POSTing /certificate/sign: {"error":{},"errorString":"[Exception... \"NS_ERROR_NET_RESET\"  nsresult: \"0x804b0014 (NS_ERROR_NET_RESET)\"  location: \"JS frame :: resource://services-common/rest.js :: onStopRequest :: line 465\"  data: no]","message":null,"code":null,"errno":null}
1438116403522	FirefoxAccounts	ERROR	HAWK.signCertificate error: {"error":{},"errorString":"[Exception... \"NS_ERROR_NET_RESET\"  nsresult: \"0x804b0014 (NS_ERROR_NET_RESET)\"  location: \"JS frame :: resource://services-common/rest.js :: onStopRequest :: line 465\"  data: no]","message":null,"code":null,"errno":null}
1438116403522	FirefoxAccounts	ERROR	HAWK.signCertificate error: {"error":{},"errorString":"[Exception... \"NS_ERROR_NET_RESET\"  nsresult: \"0x804b0014 (NS_ERROR_NET_RESET)\"  location: \"JS frame :: resource://services-common/rest.js :: onStopRequest :: line 465\"  data: no]","message":null,"code":null,"errno":null}
1438116403524	Sync.BrowserIDManager	ERROR	Non-authentication error in _fetchTokenForUser: {"error":{},"errorString":"[Exception... \"NS_ERROR_NET_RESET\"  nsresult: \"0x804b0014 (NS_ERROR_NET_RESET)\"  location: \"JS frame :: resource://services-common/rest.js :: onStopRequest :: line 465\"  data: no]","message":null,"code":null,"errno":null}
1438116403529	Sync.BrowserIDManager	ERROR	Background fetch for key bundle failed: {"error":{},"errorString":"[Exception... \"NS_ERROR_NET_RESET\"  nsresult: \"0x804b0014 (NS_ERROR_NET_RESET)\"  location: \"JS frame :: resource://services-common/rest.js :: onStopRequest :: line 465\"  data: no]","message":null,"code":null,"errno":null}
1438116403530	Sync.BrowserIDManager	ERROR	Could not authenticate: {"error":{},"errorString":"[Exception... \"NS_ERROR_NET_RESET\"  nsresult: \"0x804b0014 (NS_ERROR_NET_RESET)\"  location: \"JS frame :: resource://services-common/rest.js :: onStopRequest :: line 465\"  data: no]","message":null,"code":null,"errno":null}
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brancalessio
Level 2
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Posts: 97
Joined: Fri Jul 24, 2015 4:59 am

Re: Firefox Sync not working on Linux Mint 17.2 Rafaela 64 b

Post by brancalessio »

It seems that the combination Mint + (my home network) does not work, while Windows + (my home networks) seems working. In another network, everything seems working fine.

Firefox synchronization encounters several errors in authentication. Funny enough, also I could not authenticate in Firefox Hello in my home wifi, but I could in the other network!

Code: Select all

1438412072498	Sync.Service	INFO	Loading Weave 1.41.0
1438412072501	Sync.Engine.Clients	DEBUG	Engine initialized
1438412072503	Sync.Engine.Clients	DEBUG	Resetting clients last sync time
1438412072510	Sync.Engine.Bookmarks	DEBUG	Engine initialized
1438412072515	Sync.Engine.Forms	DEBUG	Engine initialized
1438412072521	Sync.Engine.History	DEBUG	Engine initialized
1438412072526	Sync.Engine.Passwords	DEBUG	Engine initialized
1438412072529	Sync.Engine.Prefs	DEBUG	Engine initialized
1438412072534	Sync.Engine.Tabs	DEBUG	Engine initialized
1438412072535	Sync.Engine.Tabs	DEBUG	Resetting tabs last sync time
1438412072541	Sync.Engine.Addons	DEBUG	Engine initialized
1438412072543	Sync.Service	INFO	Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:39.0) Gecko/20100101 Firefox/39.0
1438412072548	Sync.SyncScheduler	DEBUG	Clearing sync triggers and the global score.
1438412072550	Sync.Status	DEBUG	Status.service: success.status_ok => success.status_ok
1438412072550	Sync.Service	DEBUG	Caching URLs under storage user base: https://sync-196-us-west-2.sync.services.mozilla.com/1.5/18476805/
1438412072550	Sync.Status	DEBUG	Status.service: success.status_ok => success.status_ok
1438412072577	Sync.Status	DEBUG	Status.service: success.status_ok => success.status_ok
1438412072636	FirefoxAccounts	DEBUG	got keyPair
1438412072636	FirefoxAccounts	DEBUG	getCertificateSigned: true true
1438412076579	Sync.Status	DEBUG	Status.service: success.status_ok => success.status_ok
1438412076579	Sync.Service	DEBUG	User-Agent: Firefox/39.0 FxSync/1.41.0.20150629114848.
1438412076580	Sync.Service	INFO	Starting sync at 2015-08-01 08:54:36
1438412076580	Sync.Service	DEBUG	In sync: should login.
1438412076581	Sync.Status	DEBUG	Status.service: success.status_ok => success.status_ok
1438412076581	Sync.Status	DEBUG	Status.service: success.status_ok => success.status_ok
1438412194257	Hawk	WARN	hawk request error: [Exception... "NS_ERROR_NET_RESET"  nsresult: "0x804b0014 (NS_ERROR_NET_RESET)"  location: "JS frame :: resource://services-common/rest.js :: onStopRequest :: line 465"  data: no] Stack trace: onStopRequest()@resource://services-common/rest.js:465 < waitForSyncCallback()@resource://services-common/async.js:102 < makeSpinningCallback/callback.wait()@resource://services-common/async.js:145 < onNotify()@resource://gre/modules/services-sync/service.js:1000 < WrappedNotify()@resource://services-sync/util.js:148 < WrappedLock()@resource://services-sync/util.js:103 < WrappedCatch()@resource://services-sync/util.js:77 < login()@resource://gre/modules/services-sync/service.js:1022 < sync/<()@resource://gre/modules/services-sync/service.js:1272 < WrappedCatch()@resource://services-sync/util.js:77 < sync()@resource://gre/modules/services-sync/service.js:1268 < <file:unknown>
1438412194261	Sync.RESTResponse	DEBUG	Caught exception fetching HTTP status code:[Exception... "Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIHttpChannel.responseStatus]"  nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)"  location: "JS frame :: resource://services-common/rest.js :: RESTResponse.prototype.status :: line 643"  data: no] Stack trace: RESTResponse.prototype.status()@resource://services-common/rest.js:643 < _onComplete()@resource://services-common/hawkclient.js:215 < onComplete()@resource://services-common/hawkclient.js:272 < onStopRequest()@resource://services-common/rest.js:467 < waitForSyncCallback()@resource://services-common/async.js:102 < makeSpinningCallback/callback.wait()@resource://services-common/async.js:145 < onNotify()@resource://gre/modules/services-sync/service.js:1000 < WrappedNotify()@resource://services-sync/util.js:148 < WrappedLock()@resource://services-sync/util.js:103 < WrappedCatch()@resource://services-sync/util.js:77 < login()@resource://gre/modules/services-sync/service.js:1022 < sync/<()@resource://gre/modules/services-sync/service.js:1272 < WrappedCatch()@resource://services-sync/util.js:77 < sync()@resource://gre/modules/services-sync/service.js:1268 < <file:unknown>
1438412194263	Sync.RESTResponse	DEBUG	Caught exception fetching HTTP status text:[Exception... "Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIHttpChannel.responseStatusText]"  nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)"  location: "JS frame :: resource://services-common/rest.js :: RESTResponse.prototype.statusText :: line 659"  data: no] Stack trace: RESTResponse.prototype.statusText()@resource://services-common/rest.js:659 < _onComplete()@resource://services-common/hawkclient.js:218 < onComplete()@resource://services-common/hawkclient.js:272 < onStopRequest()@resource://services-common/rest.js:467 < waitForSyncCallback()@resource://services-common/async.js:102 < makeSpinningCallback/callback.wait()@resource://services-common/async.js:145 < onNotify()@resource://gre/modules/services-sync/service.js:1000 < WrappedNotify()@resource://services-sync/util.js:148 < WrappedLock()@resource://services-sync/util.js:103 < WrappedCatch()@resource://services-sync/util.js:77 < login()@resource://gre/modules/services-sync/service.js:1022 < sync/<()@resource://gre/modules/services-sync/service.js:1272 < WrappedCatch()@resource://services-sync/util.js:77 < sync()@resource://gre/modules/services-sync/service.js:1268 < <file:unknown>
1438412194263	Hawk	DEBUG	(Response) /certificate/sign: code: null - Status text: null
1438412194263	Sync.RESTResponse	TRACE	Processing response headers.
1438412194264	Sync.RESTResponse	DEBUG	Caught exception processing response headers:[Exception... "Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIHttpChannel.visitResponseHeaders]"  nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)"  location: "JS frame :: resource://services-common/rest.js :: RESTResponse.prototype.headers :: line 693"  data: no] Stack trace: RESTResponse.prototype.headers()@resource://services-common/rest.js:693 < this.HawkClient.prototype._maybeNotifyBackoff()@resource://services-common/hawkclient.js:311 < _onComplete()@resource://services-common/hawkclient.js:225 < onComplete()@resource://services-common/hawkclient.js:272 < onStopRequest()@resource://services-common/rest.js:467 < waitForSyncCallback()@resource://services-common/async.js:102 < makeSpinningCallback/callback.wait()@resource://services-common/async.js:145 < onNotify()@resource://gre/modules/services-sync/service.js:1000 < WrappedNotify()@resource://services-sync/util.js:148 < WrappedLock()@resource://services-sync/util.js:103 < WrappedCatch()@resource://services-sync/util.js:77 < login()@resource://gre/modules/services-sync/service.js:1022 < sync/<()@resource://gre/modules/services-sync/service.js:1272 < WrappedCatch()@resource://services-sync/util.js:77 < sync()@resource://gre/modules/services-sync/service.js:1268 < <file:unknown>
1438412194264	Sync.RESTResponse	TRACE	Processing response headers.
1438412194266	Sync.RESTResponse	DEBUG	Caught exception processing response headers:[Exception... "Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIHttpChannel.visitResponseHeaders]"  nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)"  location: "JS frame :: resource://services-common/rest.js :: RESTResponse.prototype.headers :: line 693"  data: no] Stack trace: RESTResponse.prototype.headers()@resource://services-common/rest.js:693 < this.HawkClient.prototype._maybeNotifyBackoff()@resource://services-common/hawkclient.js:311 < _onComplete()@resource://services-common/hawkclient.js:226 < onComplete()@resource://services-common/hawkclient.js:272 < onStopRequest()@resource://services-common/rest.js:467 < waitForSyncCallback()@resource://services-common/async.js:102 < makeSpinningCallback/callback.wait()@resource://services-common/async.js:145 < onNotify()@resource://gre/modules/services-sync/service.js:1000 < WrappedNotify()@resource://services-sync/util.js:148 < WrappedLock()@resource://services-sync/util.js:103 < WrappedCatch()@resource://services-sync/util.js:77 < login()@resource://gre/modules/services-sync/service.js:1022 < sync/<()@resource://gre/modules/services-sync/service.js:1272 < WrappedCatch()@resource://services-sync/util.js:77 < sync()@resource://gre/modules/services-sync/service.js:1268 < <file:unknown>
1438412194267	Sync.RESTResponse	DEBUG	Caught exception fetching HTTP status text:[Exception... "Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIHttpChannel.responseStatusText]"  nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)"  location: "JS frame :: resource://services-common/rest.js :: RESTResponse.prototype.statusText :: line 659"  data: no] Stack trace: RESTResponse.prototype.statusText()@resource://services-common/rest.js:659 < this.HawkClient.prototype._constructError()@resource://services-common/hawkclient.js:121 < _onComplete()@resource://services-common/hawkclient.js:231 < onComplete()@resource://services-common/hawkclient.js:272 < onStopRequest()@resource://services-common/rest.js:467 < waitForSyncCallback()@resource://services-common/async.js:102 < makeSpinningCallback/callback.wait()@resource://services-common/async.js:145 < onNotify()@resource://gre/modules/services-sync/service.js:1000 < WrappedNotify()@resource://services-sync/util.js:148 < WrappedLock()@resource://services-sync/util.js:103 < WrappedCatch()@resource://services-sync/util.js:77 < login()@resource://gre/modules/services-sync/service.js:1022 < sync/<()@resource://gre/modules/services-sync/service.js:1272 < WrappedCatch()@resource://services-sync/util.js:77 < sync()@resource://gre/modules/services-sync/service.js:1268 < <file:unknown>
1438412194268	Sync.RESTResponse	DEBUG	Caught exception fetching HTTP status code:[Exception... "Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIHttpChannel.responseStatus]"  nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)"  location: "JS frame :: resource://services-common/rest.js :: RESTResponse.prototype.status :: line 643"  data: no] Stack trace: RESTResponse.prototype.status()@resource://services-common/rest.js:643 < this.HawkClient.prototype._constructError()@resource://services-common/hawkclient.js:122 < _onComplete()@resource://services-common/hawkclient.js:231 < onComplete()@resource://services-common/hawkclient.js:272 < onStopRequest()@resource://services-common/rest.js:467 < waitForSyncCallback()@resource://services-common/async.js:102 < makeSpinningCallback/callback.wait()@resource://services-common/async.js:145 < onNotify()@resource://gre/modules/services-sync/service.js:1000 < WrappedNotify()@resource://services-sync/util.js:148 < WrappedLock()@resource://services-sync/util.js:103 < WrappedCatch()@resource://services-sync/util.js:77 < login()@resource://gre/modules/services-sync/service.js:1022 < sync/<()@resource://gre/modules/services-sync/service.js:1272 < WrappedCatch()@resource://services-sync/util.js:77 < sync()@resource://gre/modules/services-sync/service.js:1268 < <file:unknown>
1438412194270	Sync.RESTResponse	DEBUG	Caught exception fetching HTTP status code:[Exception... "Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIHttpChannel.responseStatus]"  nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)"  location: "JS frame :: resource://services-common/rest.js :: RESTResponse.prototype.status :: line 643"  data: no] Stack trace: RESTResponse.prototype.status()@resource://services-common/rest.js:643 < this.HawkClient.prototype._constructError()@resource://services-common/hawkclient.js:123 < _onComplete()@resource://services-common/hawkclient.js:231 < onComplete()@resource://services-common/hawkclient.js:272 < onStopRequest()@resource://services-common/rest.js:467 < waitForSyncCallback()@resource://services-common/async.js:102 < makeSpinningCallback/callback.wait()@resource://services-common/async.js:145 < onNotify()@resource://gre/modules/services-sync/service.js:1000 < WrappedNotify()@resource://services-sync/util.js:148 < WrappedLock()@resource://services-sync/util.js:103 < WrappedCatch()@resource://services-sync/util.js:77 < login()@resource://gre/modules/services-sync/service.js:1022 < sync/<()@resource://gre/modules/services-sync/service.js:1272 < WrappedCatch()@resource://services-sync/util.js:77 < sync()@resource://gre/modules/services-sync/service.js:1268 < <file:unknown>
1438412194270	Sync.RESTResponse	TRACE	Processing response headers.
1438412194272	Sync.RESTResponse	DEBUG	Caught exception processing response headers:[Exception... "Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIHttpChannel.visitResponseHeaders]"  nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)"  location: "JS frame :: resource://services-common/rest.js :: RESTResponse.prototype.headers :: line 693"  data: no] Stack trace: RESTResponse.prototype.headers()@resource://services-common/rest.js:693 < this.HawkClient.prototype._constructError()@resource://services-common/hawkclient.js:128 < _onComplete()@resource://services-common/hawkclient.js:231 < onComplete()@resource://services-common/hawkclient.js:272 < onStopRequest()@resource://services-common/rest.js:467 < waitForSyncCallback()@resource://services-common/async.js:102 < makeSpinningCallback/callback.wait()@resource://services-common/async.js:145 < onNotify()@resource://gre/modules/services-sync/service.js:1000 < WrappedNotify()@resource://services-sync/util.js:148 < WrappedLock()@resource://services-sync/util.js:103 < WrappedCatch()@resource://services-sync/util.js:77 < login()@resource://gre/modules/services-sync/service.js:1022 < sync/<()@resource://gre/modules/services-sync/service.js:1272 < WrappedCatch()@resource://services-sync/util.js:77 < sync()@resource://gre/modules/services-sync/service.js:1268 < <file:unknown>
1438412194272	FirefoxAccounts	ERROR	error POSTing /certificate/sign: {"error":{},"errorString":"[Exception... \"NS_ERROR_NET_RESET\"  nsresult: \"0x804b0014 (NS_ERROR_NET_RESET)\"  location: \"JS frame :: resource://services-common/rest.js :: onStopRequest :: line 465\"  data: no]","message":null,"code":null,"errno":null}
1438412194273	FirefoxAccounts	ERROR	HAWK.signCertificate error: {"error":{},"errorString":"[Exception... \"NS_ERROR_NET_RESET\"  nsresult: \"0x804b0014 (NS_ERROR_NET_RESET)\"  location: \"JS frame :: resource://services-common/rest.js :: onStopRequest :: line 465\"  data: no]","message":null,"code":null,"errno":null}
1438412194273	Sync.BrowserIDManager	ERROR	Non-authentication error in _fetchTokenForUser: {"error":{},"errorString":"[Exception... \"NS_ERROR_NET_RESET\"  nsresult: \"0x804b0014 (NS_ERROR_NET_RESET)\"  location: \"JS frame :: resource://services-common/rest.js :: onStopRequest :: line 465\"  data: no]","message":null,"code":null,"errno":null}
1438412194274	Sync.Status	DEBUG	Status.login: success.login => error.login.reason.network
1438412194274	Sync.Status	DEBUG	Status.service: success.status_ok => error.login.failed
1438412194278	Sync.BrowserIDManager	ERROR	Background fetch for key bundle failed: {"error":{},"errorString":"[Exception... \"NS_ERROR_NET_RESET\"  nsresult: \"0x804b0014 (NS_ERROR_NET_RESET)\"  location: \"JS frame :: resource://services-common/rest.js :: onStopRequest :: line 465\"  data: no]","message":null,"code":null,"errno":null}
1438412194279	Sync.BrowserIDManager	ERROR	Could not authenticate: {"error":{},"errorString":"[Exception... \"NS_ERROR_NET_RESET\"  nsresult: \"0x804b0014 (NS_ERROR_NET_RESET)\"  location: \"JS frame :: resource://services-common/rest.js :: onStopRequest :: line 465\"  data: no]","message":null,"code":null,"errno":null}
1438412194280	Sync.SyncScheduler	DEBUG	Clearing sync triggers and the global score.
1438412194281	Sync.SyncScheduler	DEBUG	Next sync in 3600000 ms.
This happens also with cable network (not only wifi).
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RedRain

Re: Firefox Sync not working on Linux Mint 17.2 Rafaela 64 b

Post by RedRain »

I have a simulare problem. I can log in to my sync account and it syncs my bookmarks and extensions and such.. works fine. But when I restart firefox it claims that I have enterd the wrong password or e-mail and sync is disconnected. I have to login manually every time. Any suggestions?
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brancalessio
Level 2
Level 2
Posts: 97
Joined: Fri Jul 24, 2015 4:59 am

Re: Firefox Sync not working on Linux Mint 17.2 Rafaela 64 bit

Post by brancalessio »

For completeness I post a workaround that works for me.

I manually modified the MTU to 1250 (the default value is 1500) with

sudo ifconfig eth0 mtu 1250
sudo ifconfig wlan0 mtu 1250

This seems to be a workaround, but I cannot explain why Firefox on Windows 10 has not the same issue (and the default value for MTU is 1500 in Windows 10 too).

I must say that my ISP is Unitymedia (only ipv6, which seems to make some web sites unreachable) and I am not the only one to have issues:

https://support.mozilla.org/en-US/questions/1059072

I must also say that on a previous installation of Ubuntu 12.04 such a issue was not present, but I cannot say why.
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