Why Firefox Sync does not work on my home network, but at work?
Firefox Sync on my laptop does not work when my laptop is connected to my home network, but for example if I'm at my desk.
The internet connection in my house is fine, I can surf the web with this same Firefox on IPv4 and IPv6, DNS etc. also works. Connection to accounts.firefox.com works also, as Firefox for the sync account. Only the synchronization process runs aground. On my desktop at home, I have exactly the same problems. When I open https://sync-209-us-west-2.sync.services.mozilla.com/ in a browser tab, I see a confirmation message that synchronization runs on this server, so apparently the network path between my computer and this server is free.
After investigation with Wireshark, I see the TLS negotiation successfully, then packages the client was able to respond and after some time, the server closes the connection (encrypted alert). Apparently, no content is transferred between the client and the server. I have attached a screenshot of how Wireshark sees the conversation between the server and the client (sending pictures here did not work so I put on the web: http://ibin.co/1zXABHKdj5mA).
To exclude a possible configuration problem or bad module, I created a clean Firefox profile and logged into my account in Firefox, but this shows exactly the same problems.
Fun fact: Firefox on my Android phone will sync on my home network.
Below, I will link two logs, a successful synchronization (corporate network) and a synchronization failed (home network):
Sync @ Office: http://pastebin.com/rZmfrbdL
Sync @ home: http://pastebin.com/a3KUCevJ
The problem seems to be with your ISP - you can refer to https://bugzilla.mozilla.org/show_bug.cgi?id=1118958 and they may be able to find a workaround by changing your diet or to help you configure a different MTU for the network.
I hope this helps.
Mark
Tags: Firefox
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