When trying to access ArchiOffice/EngineerOffice, user gets an error:
Server Error in '/AO20xx' Application.
Unable to serialize the session state. In 'StateServer' and 'SQLServer' mode, ASP.NET will serialize the session state objects, and as a result non-serializable object or MarshalByRef objects are not permitted. The same restriction applies if similar serialization is done by the custom session state store in 'Custom' mode.
To resolve this, change the session state in IIS
1. In IIS manager tool, go to AO20xx and click on Session State.
2. Change it to 'In Process'.
3. Click Apply and then restart the IIS server.