Set higher timeout for the Web Admin in Plesk Panel for Windows
The webadmin is an aspx application and it's default timeout is often 2-3 minutes, because session state for that app is InProc (default) and so this is subject to the app recycling pool of IIS (often less than 5 minutes). The problem is especially relevant on servers with a low load (when no users are clicking anything for some time, processes are killed and so the session state, causing a frequent session expiration).
It should be enough to set Web.config file for the webadmin aspx application to store session state in a SQL server custom db
Marco Marsala
shared this idea
Unfortunately, we have to close your request, because over the years it has not become quite popular for further implementation.
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IG
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Vikas
commented
IIS supports two level of session timeouts - application pool level and application level. The application pool timeout should be higher than application timeout. Otherwise at the time of application pool timeout itself the application times out an gives session error.