I'm behind a corporate proxy server and I had no issues with this until a couple of months ago. First I was using FoxyProxy, and one day I realized that Firefox wasn't syncing so I started troubleshooting (Troubleshoot mode) and found out that when a proxy addon (now I moved to SmartProxy and it's the same) is enabled Sync fails. I even tried setting up a new profile with a different, new, Firefox Sync account and the outcome is the same. Anyone else having this trouble? Is this a bug? Should I report it? Anyone wants to help me reproduce it? Thanks in advance!
PS: This happens on my Windows 10 machine too.
Here's the Sync log
1 Answer
We don't know what is this corporate proxy and what has changed with it that causes this problem.
It's possible that your proxy sends an "Authorization" header with the authentication info, and perhaps the corporate proxy is now stripping or modifying that header.
You could try using a VPN instead of a proxy, but the corporate proxy might also block that option. Your company is apparently beefing up its security with some measures, perhaps designed to block infected computers from sending hidden data to their control center.
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