Symptoms
Parallels RAS Gateway Agent showing "Port mismatch" status in RAS Console.
Cause
The following services could start listening to ports 80 or 443 before the RAS SecureClientGateway service:
- Web Deployment Agent Service
- SQL Server Reporting services
- IIS
- World Wide Web Publishing service
- IIS Admin Service
- RD Gateway Service
- KDC Proxy Server Service (KPS) is enabled.
Resolution1
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
Resolution2
Change the RAS Gateway port for TLS/SSL connections from 80/443 to some other available port.
Reference
How to determine what services are running under a SVCHOST.EXE process
View the List of Services Hosted by the svchost.exe Process in Windows
Windows Server 2012 - No response for request to KDC Proxy Server.
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