Parallels RAS Gateway Agent showing "Port mismatch" status in RAS Console.
The following services could start listening to ports 80 or 443 before the RAS SecureClientGateway service:
- Web Deployment Agent Service
- SQL Server Reporting services
- World Wide Web Publishing service
- IIS Admin Service
- RD Gateway Service
- KDC Proxy Server Service (KPS) is enabled.
Find which service is using port 80/443 using "netstat" command.
Stop the service that is listening to port 80/443 if it is not needed or change its configuration to listen to a different port so that RAS Gateway could work correctly.
For IIS, instructions are present here: https://stackoverflow.com/questions/19312136/how-do-i-change-iis-express-8-port-80-to-8080
Change the RAS Gateway port for TLS/SSL connections from 80/443 to some other available port.