minimwatch does not see minimserver

[geemex]

I changed my router, everything runs fine, alas MinimWatch not. MinimWatchIcon stays gray since today.
MinimWatch searches the MinimServer at Port 9791 but the Server runs at Port 9790. I recognised that the first time, since Minim runs fine without any hassles since years!

Log:

Retrying monitor subscription for server at 10.0.0.91:9791 (attempt 18)
Retrying monitor subscription for server at 10.0.0.91:9791 (attempt 19)
Retrying monitor subscription for server at 10.0.0.91:9791 (attempt 20)
Retrying monitor subscription for server at 10.0.0.91:9791 (attempt 21)
and so on

What happened?