Hi Guenter,
Please review the VarAC and Swisslog configuration as explained in the VarAC documentation (
https://www.varac-hamradio.com/forum/man...ewer-epb1g). I tested here and works perfectly. Keep in mind that if you are using another software working at the same time along Swisslog and VarAC on TCP port 52001, you need to change port number. Otherwise there will be a conflict because TCP connections can only be performed in a two-way direction (server-client).
Review also that you have added exceptions to Swisslog and VarAC either in your antivirus and firewall.
If you still have issues contact me directly via whatsapp to arrange a remote Teamviewer session (you have my number).
Best 73