Client side browser issue

I am beginning to get reports regarding client's browsers freezing up when attempting to log into the solution. It first started with just a few but now more and more issues are being reported with the site.

Evidently, the issue is with IE6. I have not contacted any of our clients directly regarding this yet but I am sure they are experiencing an issue as for I have 20+ complaints.

Has anyone else ran into this issue? Is it related to browser settings? Java? Client side firewall or proxy setting? I have tested with IE6 and have been unable to reproduce the issue. Has anyone else ran into this issue. Whats the resolution? Thanks in advance.

-TravelHoldings