ArchiOffice/EngineerOffice 20xx session times out due to inactivity even after modifying those settings as per this KB article.
To resolve this issue:
1. Go to the IIS Manager (Run as Administrator).
2. Under Connections on the left, select Application Pools.
3. Then select AO20xxAppPool and click Recycling on the right.
4. On the Edit Application Pool Recycling Settings screen, uncheck the 'Regular time intervals' option.
5. Check the 'Specific time(s)' option and enter 1:00 AM there.
6. Click Next and choose whether to set event log entries for this or not.
7. Click Finish.
8. Next, verify the AO20xx web site's Session State settings.
9. At an elevated command prompt, type IISRESET.