Virual VP and TCP/IP Port errors

Hi

I have setup virtual vp with TCP/IP ports 5511 for weatherlink and 5512 for WD

Recently weatherlink after a few days can not connect and i getting a error that port 5511 is being occupied . I have to open another port 5514 for example, but still after a couple of days that port also seems busy and weatherlink can not connect.

I have setup weatherlink to download data from data logger every 5 minutes .

Any possible solution ?

Thanks

Nikolas