we have a couple of laptop running Win7 64bit where Cisco Anyconnect does not work. We always get this error :
Please check if there is any firewall or anti-virus running on your PC? Also see if the Anyconnect Vpn adapter gets enabled on your PC or not?
You can probably test with other PCs just to make sure it is not a PC issue. Have you tried the latest 2.5.2010 client?
Also the event viewer logs and DART might give you some details but I would suggest you open up a TAC case if you want to troubleshoot with those logs.
It could be some application on that particular PC which is causing the connection failure.Check for any messages below on the gui to see where is stops( you will get messages like downloading profile,activating vpn adapter..so see after what message you get the error) A few other things you could try.
Test with the latest client 2.5.2010.
Uninstall the firewall and anti-virus and then connect and test.
Go to the ssl portal page( browser page) and try connecting using Anyconnect from there. If it works means that there is a problem with standalone client on that PC.
Collect DART logs. They are basically event logs collected by the client itself which will mostly likely provide the reason on the connection failure. You can see how to collect that here:
Also if you are not able to pinpoint to why the failure is occurring you could open up a case with the Cisco Technical Assistance centre (TAC) who can help you troubleshoot this further.