KB486914: A “Failed to fetch” error appears when logging in to the MicroStrategy connector

Symptom

After successfully deploying the Strategy connector, when trying to import data from another Strategy environment and/or project, it is not possible to log in to Library Server. A “Failed to fetch” error message appears on the screen. Additionally, network traces show a 403 HTTP code response from the Library Server.
 

Steps to Reproduce

1. Deploy and configure the Strategy connector by following the MicroStrategy connector documentation.
2. Log in to Strategy Web.
3. Click on “Add External Data”.
4. Click on “Strategy” to use the Strategy connector.
5. Fill in the Library Server details, and press “Connect”.

Cause

This error may be caused by an incorrect Java version when running Strategy Web, Strategy Library or the Strategy connector on Tomcat. For example, this error will appear when running Strategy 2021 Update 12 on Tomcat 9.x with Java 17 configured.
 

Action

Ensure to use a Java version that is certified for the Strategy Version being used. In the given example, for Strategy 2021 Update 12, Java 11 needs to be installed. To double check which Java version is certified for the Strategy version, please review the MicroStrategy Certifications Dashboard.
To learn about other reasons that could be causing this issue, see KB483744: An error appears when logging in to the MicroStrategy connector.