Different types of filters can be used. One is only admissable programs can operate. One is bandwidth throttler for certain programs. One is firewalls that block programs not on the allowed list. Another is blocking of certain ranges of ports.

Try using a different port setting such as between 49152 - 65535; a good one to try is 64049. For more on how to change these settings see Manual port forward instructions & sample image. Initially just try changing the listening port. Then change the connection port & set to port forward setting.

However from what I just found out about the CIPAfilter it looks rather potent.