Hm, if you use OpenConnect on the command line do you see the same problem? What MTU does OpenConnect actually ask for? And if you update to the latest version from git (which I really ought to release as 7.08 some time soon) does that fix it?
The Arch bug you link is ancient; that sounds like it's from the days when NetworkManager didn't actually honour the MTU that OpenConnect requested. That shouldn't be the case nowadays. -- dwmw2
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