Port 9790 in use - can't install MinimServer

[DSK]

Synology DS212 NAS
DSM 5.2 Update 3
Java SE Embeded 8u71

I updated DSM to latest version (Above) and then Java to 8u71.

I then uninstalled MinimServer 0.8.3.1 (armV5) and went to install 0.8.3.4 (armV5) but got an error that Java wasn't installed properly. The Java install had displayed a message at the end saying that it had installed successfully but checking the log showed problems (patters then fixed the 8u71 download and I installed it successfully and it is running fine).

I then retried installing MinimServer 0.8.3.4 (and also retried 0.8.3.1) but get a message saying that Port 9790 is in use.

I have rebooted the NAS and the laptop a couple of times each and retried but get the same error.

Nothing else on the NAS or laptop has changed. The MinimServer installation instructions just say that this issue should disappear after a couple of minutes, but it doesn't.

I searched the forum but couldn't find a fix.

Can anyone help?