And a thorough description of the problem / question:
I can no longer set up connected mode. Once I set the server connection and the project key and hit Apply or OK, I get the following error:
SonarQube server has version 9.7.1.62043. Version should be greater or equal to 9.9
I can’t find any documentation that says support for 9.7 has been dropped, and it seems that 8.9+ should be supported.
Indeed, SonarLint for IntelliJ 10.7 dropped support for SonarQube versions < 9.9 LTA. There is a SonarQube policy about what versions are active and supported.
I would advise you to update to SonarQube 9.9 LTA if possible.
Sorry for the inconvenience, as the the official announcement about this version is not out yet. It would have featured the information that we dropped support on older versions.
Also, thanks for the hint about the docs (cc @kevin.hinz) as it seems that we missed that spot and left you in the dark here as well, sorry for that