We are having a pesky problem with our ISA operations. Seems that from time to time our internal users (on a 10.2.x.x network) when the try to go to the internet get prompted with a box prompting for user name, password and domain. There seems to be no rhyme or reason as to WHY this pops up. We have checked multiple setting on the ISA configuration but cant seem to locate what will cause this window to pop-up. I would appreciate any tips or advice on how wo troubleshoot this issue. Thanks you in advance... Brian G.