XG Firewall version 19.0.1 MR1 build 365 and Sophos Connect 2.2.75 client are affected.
After a successful IPSec connection, after a few hours, the user is unexpectedly logged out of the firewall. The IPSec connection itself continues to work, but any rules that rely on user accounts stop passing connections from that user.
In the Authentication and VPN logs, I do not find any information that the user has been logged out. The only tangible trace is the "Current activities" list, from which the entry about an active IPSec connection disappears.
I am asking for a hint where to look for the source of the problem.
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