KB-2002 Users unable to access Sites due to 403 errors following an upgrade

Symptoms

After an upgrade, some users get 403 Access Denied errors when attempting to access various Sites that they normally have access to.

The application server log shows the following error:

Caused by: com.appiancorp.core.expr.exceptions.ExpressionRuntimeException$AppianExceptionProvider: Expression evaluation error [evaluation ID = XXXXXX] : 
The Site [name=“XXX”] does not exist, has been deleted, or you do not have sufficient privileges to access its data. (APNX-1-4198-000)

Cause

This issue has been reported to the Appian Product Team. The reference number for this issue is AN-140947.

Action

Select the affected site on Appian Designer.
Click Security.
Save changes, but do not make actual changes to the site security, other than re-saving original security permissions.

Affected Versions

This article applies to all versions of Appian.

Last Reviewed: September 2019