try in your browser
http://HPSERVERLX:55000Where HPSERVERLX would be your server name.
If success then uninstall on the pc the hp app and the connector app.
Make sure on the hp app that sometimes you may get two of them then delete them both and the connector app.
and install from your server.
Each server version has it's own connector version.
The install cd does have a older connector version and does try to connect to the server to check for updates but at times it will fail and install a mismatched connector which will not work.
If you have all the CD's I would just start fresh with a reset or recovery. But the process above will need to be done each time the server updates because the connector will be out of sync with the server,
FYI,
If you are win10 64bit then the hp app installed on the pc will have (64) in the name