Using Chromium Version 78.0.3904.108 (Official Build) running on Ubuntu 18.04 (64-bit)
I get this:
Your browser sent a request that this server could not understand.Size of a request header field exceeds server limit.
No such problem on Firefox 70.0.1
Something changed at the server end, I think, not at my end.
Go to Answer
The first thing to try is to clear the browser history of VM cache and cookies or try incognito mode - just to check if that is the cause. Restart the browser as well after doing so.
The same as when you last had a problem: https://community.virginmedia.com/t5/Forum-Archive/Email-Login-Fail-on-Chromium/m-p/3722336
If it persists - then other community members will see if they also have a problem or can replicate it. They will suggest other self-help ideas or refer to the Forum team for escalation. Good luck.
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Specifically it seems to be the vm mail cookie for chrome that the server can't handle. Deleted using chrome://settings/siteData. Now fixed.