Project Web App cannot connect to Project Server after December 2011 CU/hotfix

Today, after installing the December 2011 Project Server 2010 Cumulative Update and hotfix, I got the following error when trying to connect to Project Server Web Application:

Project Web App cannot connect to Project Server”

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After investigating the problem, I found this message in the Event Viewer:

“There is a compatibility range mismatch between the Web server and database "ProjectServer_Published", and connections to the data have been blocked to due to this incompatibility. This can happen when a content database has not been upgraded to be within the compatibility range of the Web server, or if the database has been upgraded to a higher level than the web server. The Web server and the database must be upgraded to the same version and build level to return to compatibility range”

To solve the issue I ran the Sharepoint 2010 Products Configuration Wizard and now I’m able to connect to Project Server Web App again.

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6 thoughts on “Project Web App cannot connect to Project Server after December 2011 CU/hotfix

  1. Thanks for posting this. I had the exact same error after running the December cumulative updates and resolved it by rerunning the Products Config Wizard and rebooting the servers.
    Thanks again.

  2. I am having this “compatibility” problem.

    Hope after running the wizard and rebooting everything will work!!!

  3. I am having the same problem but even after rerunning the products configuration wizard and rebooting I still get it! Any other regarding how to solve it?

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