LibreOffice extension not working with remote server

I can’t get the LibreOffice extension to work with my remote server. I get a “connection refused” error.

Using the Firefox LanguageTool browser plugin both my remote LT server and http://localhost:8081/v2 work just fine.

I am aware that I should not append “v2” in the LibreOffice extension. I can rule this out as a cause of error.

Has anyone exprienced this issue? Any suggestions on how to solve the problem?