Dear All, I am not sure whether any of you have faced any problem, we have Microsoft Windows Server 2003 with ISA Server 2006 Std edition. Everything works fine without with Windows XP. If we add laptop in the workgroup with Windows Vista, install Microsft Firewall Client, the ISA firewall client gets disable and gives Authentication probelm. If you open internet explorer it ask for user anme and password, you give a valid ISA server username and password and you can browse internet, even messenger works but emails does not gets downloaded. All the rules are defined correctly in ISA becasue when we us a laptop with windowsxp and use the same username and password ISA client works fine with email and remainauthenticated. When youstart vistaISA client gets disabled and you can't downlaod or send email. Canany oen help me to sort the issue. POP3 and SMTP ports are open for all in ISA. Regads, Nzm

Hi Nzm, after checking the issue, it seems this is a ISA/server related issue. As this forum focuses on Windows Vista specific issues, this inquiry would best be posted to server forum: ISA http://social.technet.microsoft.com/Forums/en-US/Forefrontedgegeneral/threads/ Windows Server http://social.technet.microsoft.com/Forums/en-US/category/windowsserver/ The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the newsgroups regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.