Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

Sophos XG firewall: RDP is slow in SSL VPN

Issue:

When user trying to access RDP service through SSL VPN it is very slow.

Troubleshooting:

When user trying to access RDP service through SSL VPN it is very slow.

Most of the times, VPN will not cause any issue in slowness

But due to heavy traffic which is being generated through the RDP service, firewall might treat it as DOS attack. So it might drop some traffic.

Here you can check if the traffic is being dropped by firewall under DOS protection

Protect>> Intrusion prevention>>DOS attacks

Intusion Prevention settings


In case if you observe any dropped packets under TCP flood Traffic dropped section, create a DOS bypass rule as shown below

Once go to intrusion prevnetion>> DOS and spoof prevention>> create DOS by pass rule as shown below

DOS Bypass rule
DOS protection rule

As shown in the above screenshot, create DOS bypass rule with source IP as “*”, destination IP as “RDP server IP”, protocol as “TCP”, source port as “*” and destination port as “3389”.

Now the concerned traffic will be bypassed from the DOS protection, so the slowness issue might be resolved.