While installing the new cisco anyconnect to users machine from certificate email for few users the installation goes fine but and it do connect for the first time but if i disconnect and connect it again it just hangs on Contacting.

I checked the CISCO site and they said to update the software package now we have the latest one but it do happens to few users. If i install a fresh laptop and do the instalaltion of cisco anyconnect i never get any problem.

It looks like the old laptop stuck with some certifcates etc. I checked with event log and searched for the error but no specific result found on google.

Any suggestion?