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WEB VPN Driver error

I have a WebVPN SSL VPN built on a 3825.  I also did this on a 7206 and had the same issue.  It has a 15.1 IOS.  I am using the most current AnyConnect client.

Most users can connect no problem.  Some users get an error "The VPN driver has encountered an error" and cannot connect.  I have had a case open for a month and haven't gotten any help from TAC.  Most users have Vista, some have XP.  Most have IE8, some have IE7.  But there is no consistent pattern that I can see for those that get this error.  I am including the vpn config below, but since most pc's can connect, I think the config is OK.  I think I have to do womthing on the pC's maybe?  But I have no idea.  Anyone have any ideas

webvpn gateway vpn
ip address port 443
http-redirect port 80
ssl trustpoint TP-self-signed-1529824412
webvpn install svc flash:/webvpn/anyconnect-win-2.5.1025-k9.pkg sequence 1
webvpn install svc flash:/webvpn/anyconnect-macosx-i386-2.5.1025-k9.pkg sequence 2
webvpn context vpn
logo file logo.jpg
secondary-color #006400
title-color #006400
ssl authenticate verify all
policy group policy_1
   functions svc-required
   timeout idle 86400
   timeout session 259200
   svc address-pool "vpn"
   svc keep-client-installed
   svc split include
   svc split include
   svc split include
   svc split include
   svc split include
   svc split include
   svc split include
   svc split include
   svc dns-server primary
   svc dns-server secondary
default-group-policy policy_1
aaa authentication list sdm_vpn_xauth_ml_1
gateway vpn
max-users 250

Cisco Employee

Re: WEB VPN Driver error

Sounds most definitely like a client issue, e.g. the virtual adapter not being installed properly.

Is there any (network related) software installed on the affected clients, that is not present on the working ones?

E.g. a personal firewall, or non-cisco vpn client, etc. ?