Remote desktop lag over VPN (NetExtender)
Jayser
Newbie ✭
Hello,
I've noticed that a couple times a week during the morning we experience lag.
We VPN in and then use Remote desktop. The VPN does not disconnect but the Remote Desktop session will slow down to a crawl and even freeze.
The firewall CPU usage is fine and the egress/ingress is fine to.
Doesn't seem that the firewall is being over used.
Any clues on on trying to troubleshoot this issue?
Thanks,
Jayser
Best Answer
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CORRECT ANSWER
Saravanan
Moderator
Hi @JAYSER,
Could you please verify the MTU on the client side ISP and ensure the value is set right? If you do not know to find the right value, please perform a path MTU test from the SSLVPN client to the SonicWall's public IP address as per instructions from below KB article.
Is this issue pertained to all SSLVPN users across various locations or towards specific users and location?
Below is a generic KB article to tweak the performance of SonicWall. Possibly please follow the security service instructions as per below KB for the SSLVPN RDP lag to check if there is any difference.
Let us know how it goes. Have a good one.
Regards
Saravanan V
Technical Support Advisor - Premier Services
Professional Services
1
Answers
we are running 6.5.2.1-31n
I am planning on upgrading to the current one this weekend.
This sounds similar to an issue that we were experiencing. The NetExtender would stay connected but the RDP session would freeze. Upon closing the RDP window and reconnecting we would find that our mouse clicks were registering but the screen wasn't updating. I Googled and found the solution below. I made the changes on both the PCs we were RDPing into and the laptops we were RDPing from. It fixed the issue for us twice.
Run gpedit.msc.
Navigate to Computer Configuration > Administration Templates > Windows Components > Remote Desktop Services > Remote Desktop Connection Client.
Set the "Turn Off UDP On Client" setting to Enabled
We tried the UDP solution for a few computers. It helped with some of the freezing for some. But this seems a bit different, like it's a slow down of RDP traffic. Everyone that is in the office doesn't feel it at all. Speed test are fine.
I forgot to mention that when we do have this issue, even if I use logmein, that is slow too.
Thank you. I'll look into that.
The weird thing is it's only happening between 8:30-Noon. After that it's fine. And it's only a handful of users.
Hi @Jayser ,
Checking in - has this question been answered?
Thank you
Did you get a response regarding this problem? We have exactly the same problem. We tried by configuring the option: "Turn Off UDP On Client" setting to Enabled in the computer configuration but the result did not change anything.
Previously we had a router limited to about thirty users. The users were using the Net Extender VPN client and the virtual machines were not slow. Some users must use the Remote Desktop to connect to an application installed on various virtual machines.
As many users now have to work remotely, a new router has been added. The old one has been decommissioned. This new router allows more VPN connection. The new client being Connect Tunnel X64. Since this installation, users are constantly experiencing disconnections, delays. What they didn't have before with the NetExtender client.
Note, when users are not in VPN, the remote desktop is not slow. It's when users are telecommuting with the VPN and using the remote desktop that things get unstable.