PS 11 upgrade issue with message service error on attempted startup.
By David Evertson
July 22, 2017

Just upgraded from 10.1x to 11.0.1, had also attemped an upgrade to 11.0.0.1.  All cases produced the following problem:

Upgrade install proceeds normally and successfully.  Starting PS service results in the PowerSchool Message service quitting and the following message in the PS Monitor:  ERROR PSLog - Unable to connect to the Application Message Service at tcp://x.x.x.x:61616. PowerSchool will continue to attempt the connection for the next 5 minute(s).

The next schema update seems to complete, but a restart of the services brings you right back to the same place, with the same schema update.

Found a solution on PowerSource at https://support.powerschool.com/article/75808

The article states that the kahadb database isn't getting verified, with kills the message service.  The solution is to rename the kahadb folder and start services, which generates a new kahadb.  There is a warning that other connected subscription services such as EdFi may not receive messages from PS, and that a full sync may be required.

I haven't checked on EdFi yet, but this did solve my problem.  Just wanted to share in case anyone else runs into this when upgrading to PS 11.0.x.  Not sure if this affects hosted users.

Dave