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Intermittent Internet for Microft ISA behind ASA device

I have just installed Cisco ASA in front of Microsoft ISA server. That is , CISCO ASA 5510 == Windows 2003 with ISA SERVER === USERS . Before I installed ASA users were able to use the Internet without any problems. But as soon as I installed the firewall the Internet becomes intermittent. Some users are able to open some pages and others are not. Sometimes you have to refresh the page is several times for each open. The firewall is running in transparent mode. I have tested all the Access lists for incoming traffic from the Internet and they all working as expected. It seems that there is some sort of domain name resolution problem to do with the Microsoft ISA server. Can anyone assist me in any way to solve this problem

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