It's been a while, but this issue deserve a wider opinion.
Basically one of our customers uses a system called 'TravelTek', a web based application to book holiday destinations.
They have been struggling with a problem for over 2 months now and I believe it to be network/browser related. So here goes;
When performing certain searches, what happens is that IE seems to timing out. I'm not going to explain it further because you'd have to know how to software works.
This only happens in IE 8/9 and only happens on their local network. I've been getting contradicting results. It works in IE outside the local network which would suggest a network issue, but then it works in every other browser aside from IE on the local network.
This has to work in IE and has only been a problem for about 2-3 months.
I know it's not a lot to go off, but if you ask me some questions I'll try and provide you with some more information. I hope someone will have some idea of what to check and how to go about troubleshooting it.