Sonicwall Global Vpn Client Slows Down Internet

[Samantha Figueredo]

Wehave a remote working using Global VPN client, and when the VPN is connected internet access is dead slow. The user is very remote so the tunnel itself is quite slow and i accept there is bandwidth limitations. That said, Ive made sure ive set the Set Default Route as this Gateway unchecked so that the remote user is using their local gateway route which i can confirm is working. But i think the issue is more related to DNS queries which is happening over the link as the DNS server assigned by the VPN DHCP pool is at the VPN end.

I will need to send some DNS queries over the link (ones intended for the local domain) but ideally other DNS queries would use the locally assigned DNS server for the remote user. Im thinking a dirty hack for this one person would be to throw some hosts entries into the local PC but i cant workout how to set static IP address for this specific client the global VPN client so that i can use a different DNS server.

ok think i might have come up with something. On the global VPN adaptor on the PC ive just set fixed DNS Servers (left IP dynamic) and set 8.8.8.8 as primary and corporate as secondary. Think that should do the trick. Or any other better ideas?

So thats helped DNS resolutions, but its clear that the downloads are still coming via the tunnel, but uploads are using the local gateway. See attached screen shots of speedtest with VPN ON and OFF. Also status page showing default traffic tunnelled to peer is disabled. Any ideas?

Hi. I do, but the issue is the other clients internet speed and throughput to the remote end is the same, so there is no difference in speedtest results. I will ask the client to try to hot spot on their phone as that will have a different subnet as the remote end.

You must the change GVC VPN interface ip adress. This configuration isn't correct. Remote user network ip and Sonicwall VPN subnet must be different. after change the vpn interface ip address, problem will be resolve.

Inexplicably, this happens as soon as I open the client. Without even connecting to a VPN. The slowdown happens with or without the VPN connected. As soon as I shut down the client, my network speed goes back to normal.

Having the same issue, if I uninstall the Sonicwall GVC Client, WiFi works flawlessly. Once it is installed the WiFi Download speed is terrible, whilst upload is fine irrespective of whether or not I have an active VPN connection.

I did see a thread where an upgrade from Windows 8.1 to Windows 10 with a VPN Client (Sonicwall or Cisco) installed caused a potential registry key issue, just wondering whether or not a recent Windows 10 update has done something else. Be interested to see if anyone else experiences this and resolves it.

Evidently this is an issue with Windows 10. The solution is to disable Receive Segment Coalescing on the wireless adapter. Microsoft actually provides an automated fix as a download. It worked like a charm. I am back to my 50-80 Mbps download speeds with the VPN client running.

This has been plaguing my Surface for sometime now. For me, my WiFi speeds were terrible, with web pages taking ages to load images and text. I found that disabling the Citrix DNE filter from the wireless network properties completely resolved my issue. - if you disable this client, you are not able to use the global connect client until you re-enable. Perhaps a compatibility issue between the DNE and MS?

I had spent quite a bit of time trying to troubleshoot this and my workaround was to keep running the old out of date Global VPN client. Seems like SonicWall should be aware of this issue and update their Global VPN Client, or at least provide documentation of this resolution.

In another current case, the computer is running Windows 10 Pro 64 bit and SonicWALL GVC 4.10.2 and the slowness problem occurs when the computer has the wireless connected, but the problem goes away when the ethernet cable is connected and being used.

I work as an I.T. consultant, and I often have to install various VPN clients on my computer in order to connect to customer's networks; beginning in March 2020, I started always working from home for well known reasons.

Until a couple months ago I had a 100 Mb/s ADSL Internet connection, thus I never noticed what I'm describing next; then I upgraded my connection to a FTTH 1Gb/s connection, which normally achieves 800-900 MB/s download speed and 100 Mb/s upload speed.

However, when I install some VPN clients, namely FortiClient and ForcePoint, something strange happens: my download speed gets capped at about 400 MB/s, even if no VPN connection is established and even if I kill all VPN-related processes and stop all related services; even if the VPN client software is not in use, and even is no process is running for it, my network connection still gets awfully slowed down; the only way to solve this is to completely uninstall the VPN client software.

This is not an isolated case on my PC, I have observed it on several different computers and it has been reported by other people using the software I mentioned; this seems to be an issue related to installing those specific VPN client packages, it's noticeable only when you actually have a fast Internet connection (the slowdown seems to cap it at about 400 Mb/s, you won't even notice it at all if your connection is slower to begin with) and it happens as soon as the software is installed, regardless of its actual usage; the only resolution is to uninstall the offending software.

It looks like the issue is caused by network filter drivers which during the setup are installed and bound to all network adapters in the system, including the physical NICs and other virtual adapters which don't have any relationship at all with the VPN client you are installing.

Bring up the full list with PowerShell Get-NetAdapterBinding, and check in the individual adapter settings which devices have which bindings enabled. Disable network Adapters generally not used, and individually disable bindings not needed on specific adapters (there is a high probability the VPN software A can and does correctly handle the case where it is not attached to the virtual network adapter of VPN Software B).

Bring up the list of adapter options via PowerShell get-netadapter Format-list -property "*" and compare whether any option is changed with a specific softwares drivers enabled. Lowering MTU settings would a far from elegant but easily tested & reverted method of working around a wide range of bugs and incompatible configurations.

The problem is Citrix's DNE Lightweight Filter. You can disable it, but then your vpn connection won't work. I don't know what citrix did, but their driver either hogs or somehow reduces your internet bandwidth.

I have seen several posts about VPNs not working with T-Mobile Home Internet. What is T-Mobile's plan to address this? I contacted my corporate IT department and they said it's not their VPN. All works fine on my old ATT home internet and Verizon Hotspot (work cell). Maybe I should drop T-Mobile Home Internet and go back to ATT.

im so annoyed that I switched to the T-Mobile high speed broadband new technology that NO ONE at T-Mobile advised this would be an issue. Even calling tech support, they had no idea what the issue would be. After my IT department figured it out I HAD TO CALL BACK T-MOBILE AND BRUNG THEM UP TO SPEED. Am I in the twilight zone? Ridiculous

I contacted T-Mobile support. They indicated the software on my router had been updated to latest version which had issues with global protect. They rolled me back to previous version and it started working. It took 2-3 days, but I have been using it since Friday and all seems to be working.

It took a while, but I finally got my IT dept to lower the MTU for me. They refused to use netsh for some reason, but they were able to set it through group policy, or maybe it was a registry setting, I forget. Anyway, they set it to 1350, and everything seems to be working now.

Not sure I understand the why??but all webpages and my cloud providers load just fine for me? I have private Internet access as a VPN and have no problems, download speeds are slowed down a bit with the VPN on but that was true with my last service provider.

I had the same issue as everyone was saying. I called the support, they rolled back firmware version to 0168 on the device. But i still not able to access internet while i am on VPN. I am able to connect but unable to access internet over VPN.

I was able to successfully connect thru GlobalConnect, however occasionally I would lose internet connectivity. Of greater importance, I was unable to maintain a RDP connection to Windows Servers (2016 and 2019). I could connect to the server, however it would drop after 20-30 seconds. RDP connections to Workstations running Windows10 worked fine.

Called T-Mobile Home Internet Tech Support at 844-275-9310, tonight on Sept 2nd 2021. After a decent hold time, the representative got on the line, told him we had the GlobalProtect conflict, and he seemed to know immediately what to do.

Interesting part is I asked him what they were going to do, and he said they would NOT roll back to .168. Instead, he said T-Mobile has recognized they had issues with not only GlobalProtect but also other VPNs (believe he mentioned Cisco), and so their engineers have been working on it.

He then remotely put our router on version 1.2101.00.1609. (before the call we were on .0178). My wife then got on GlobalProtect, tested all her apps, and at least with a few minutes of testing everything seems to be working well now.

For ordinary computer users understanding how VPN works is not a fun task, while most Americans even never heard the word. If you are a T-Mobile user, VPN setting issues can be resolved without inventing a new wheel or spending a whole day for settings unless you enjoy it.

Over the last week or so, I have been receiving complaints from my client stating that their internet speeds are painfully slow. I ran a speedtest from speedtest.net and they were getting 100 down / 10 Up, so it's not an issue with download speeds. I verified the issue is it can take 6-10 seconds to load a website. Websites that are especially graphics-heavy or secure, such as banking websites, seem to take the longest. (HTTPS scanning and HTTP scanning are disabled)

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