Big question for VPN gurus, with a long story.  I got a new machine with Windows 8 in late December 2012.  I work remotely for a bunch of different customers, so 100% of my work is done via VPNs.  My customers use a wide variety of VPN types.  These were all working fine up through early December 2013.  Suddenly a bunch of them stopped working.  I tried a ton of stuff: - Uninstalling all VPN clients and reinstalling them one at a time - Reinstalling / updating network drivers - Turning off and uninstalling antivirus and firewall software

- Verified problem was on my machine, not local network, both by testing other machines on local network and by testing this machine on other networks

The following VPN clients would not work: Cisco VPN Client FortiSSL

Microsoft built-in

The following VPN clients had no problems: Cisco AnyConnect ShrewSoft Juniper web-based SSL VPN

Check Point web-based SSL VPN

As you can imagine, having to use a second (Windows XP) machine to connect to half my customers was a source of some serious headaches.  After 3 weeks of beating my head against this, I finally upgraded my OS to Windows 8.1.  The hail mary worked; my VPN problems went away!

Two weeks later, the exact same symptoms resurfaced.  I've gone back through a bunch of the steps that didn't help the first time around, with the same results.  I expect a system refresh would probably do the trick, probably temporarily like the OS upgrade, but I can't afford to spend a week reinstalling dozens of critical applications only to have the problem resurface after another couple of weeks.

At this point, the closest thing I have to a clue is that in both cases the problems started soon after installing an update to the Cisco AnyConnect client.  After uninstalling the client, the problems do not go away.

Exactly what do I mean when I say the VPN clients don't work?  That varies from one client to the next: Microsoft built-in: Error 720 FortiSSL: variable - sometimes won't finish connecting, sometimes connects for about a second

Cisco: variable - sometime won't finish connecting, sometimes "connects" but I can't access anything

Has anybody seen this sort of behavior before?  Any suggestions for fixes I may not have tried yet?  Thanks in advance.

Hi,

For this issue,let us try the following command to reset TCP/IP:

netsh int ip reset c:\resetlog.txt

netsh winsock reset

Note:please use command prompt(with admin rights) to execute the command above.

Regards,

Hi Kelvin, thanks for the response.  Tried that procedure, complete with the reboot prescribed by the commands' responses.  No change.