Just to check, did you set the FME Server web url inside the fmeServerConfig.txt file?From my testing, the host used in the logUrl will come from the value set inside that file.
The instructions for updating that are under the heading Modify the FME Server Web URL to Use HTTPS on configuring for https documentation page (https://docs.safe.com/fme/html/FME_Server_Documentation/Content/AdminGuide/configuring_for_https.htm)