Users cannot open their tickets any longer
We do have a strange issue that a handful of users is not able to open their tickets any more since last Thursday. The tickets are visible under My Requests for the affected user but when clicking the ticket to open, they get an error that the ticket doesn't exist or access rights are missing. Other users in the same domain are doing fine. Users who are affected are in different domains/forests.
I haven't changed any permissions, membership or anything else that might affect access to the tickets. The Affected User object is correct, nothing missing. Tickets are still active/submitted and present, they were created last week. Helpdesk or myself can open them without an error message. I cannot find anything that looks like a configuration issue. History of each ticket looks fine to me, assignments and changes to the ticket are all recorded. Nothing has been changed on the servers or portal either. Portal version is 22.214.171.1242.
Any idea what can cause some individual user objects not to be able to open their tickets as affected user any longer? It doesn't seem to be an enterprise-wide effect, otherwise there would be a lot more users complaining about.