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Umesh
Umesh
Explorer II
February 17, 2025
Question

SSL VPN issue with RDP

  • February 17, 2025
  • 3 replies
  • 925 views

Dear team,

 

I am experiencing issue while connecting ssl vpn, VPN connection is successfully established but it seems to be remote machine which I am trying to take RDP, getting freez. I am not able to understand where is problem, it may issue with windows machine.

 

I have come here to know anybody facing this type of issue. please let me know.

 

Windows latest security patch may be issue. while taking RDP of remote windows machine.

 

Thanks  

3 replies

Dhruvin_patel
Staff
Dhruvin_patel
Staff
February 17, 2025

Hello Umesh,

 

I understand the issue with the RDP connection after connecting to SSLVPN.

 

1) Capture the packet on the port 3389 on FortiGate to understand the traffic between client and server.

 

diagnose sniffer packet any "port 3389 and host x.x.x.x" 4 0 l

x.x.x.x is server IP address.

 

2) Try the RDP connection to the same saver locally within the same network and check the RDP connection.

 

3) It could be a Windows update, revert to the previous update and check.

 

Regards!

dingjerry_FTNT
Staff
dingjerry_FTNT
Staff
February 17, 2025

Hi @Umesh ,

 

Please add ICMP in the Service of the SSL VPN firewall policy. So once connected, please run continuous Ping.  This is to check the SSL VPN connectivity.

Jirka1
Jirka1
Explorer II
February 18, 2025

I don't think Fortinet will fix this - the problem is probably in Windows, as we have the same problem when connecting via LAN on the local network.

This GPO solution worked for us:

Local Computer Policy> Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Connections > Select network detection on the server - set to Enabled, Turn off Connect Time Detect and Continuous Network Detect

Jirka

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