I have a Pix 515 firewall and all of the sudden I am having trouble with servers that are in my DMZ. I use What is up Gold to monitor the servers in the DMZ. The problem that I am having is that I will get error message stating that the monitoring server cannot connect to the servers in the DMZ. One of the server is Web server. When I get this error I have trouble connecting to web sites on the server. The problem is corrected when I log onto the Pix and clear the xlate table. I have verion 6.3(3) OS installed on the pix. I do not have a maintenacne contract on the pix so I assume that I cannot get a newer OS version. I am not an expert with Cisco equipment so any help I can get in solving this problem would be appreciated.