Synchronize Firefox Mobile with your own Sync server

If you run your own Sync server, and tried to synchronize your Firefox Mobile browser, you may have been blocked by the “Invalid server URL” message. Or, if you added your device using the easy method of typing three strings of four characters, then the synchronization is accepted, but nothing ever gets synchronized (silent failure).

If your configuration is anything like mine, it turns out that the problem is with the SSL ciphers being used: Firefox Mobile is using RC4-SHA.

I use Nginx, so I added this line to my configuration:

ssl_ciphers HIGH:RC4-SHA:!aNULL:!MD5;

This overrides Nginxdefault value, which is currently:

ssl_ciphers HIGH:!aNULL:!MD5;

I checked my configuration at Qualys SSL Labs, and I still get a nice A grade. No harm done :-)

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