Hello, welcome to the community! And thanks for reporting this.
It seems that you are trying to use very old versions of IntelliJ and SonarLint to connect to a very recent SonarQube. If possible, I suggest that you update IntelliJ and SonarLint to more recent versions.
I would definitely recommend to update to the latest version of SonarLint (6.7 as of writing). Please note that you will also need to update IntelliJ; in case of doubt, please refer to the list of versions to check which version of SonarLint is compatible with which version of IntelliJ.
In terms of compatibility with SonarQube:
SonarLint 5.0 and above is compatible with SonarQube 7.9 and above
SonarLint 3.3 to 4.16 is compatible with SonarQube 6.7 to 7.9