Hi Teodor,
Instance 3201 is your ASCS instance dispatcher port. I would expect the the 3301 for gateway to be open on ASCS. Also 3601 for Message Server on ASCS
3300 on Application server for gateway.
Stop the SAP instances, kill the sapstartsrv processes. Delete the sapstream files this will have to be done as root perhaps I cannot recall the ownership of these files.
Kind Regards,
PS: just check on both servers that you can see the others DNS and reverse DNS correctly.