Hi Folks Not really sure whats going on with my network. I'm running SBS 2003, 4 Clients, ISA Server 2004, WSS 3.0 along side v2.0 & Windows 7 professional. For some reason each client on the domain is being requested for credentials for almost anything they do; whether that's going on the internet or opening an application. On top of that the windows security credentials dialogue box opens for no apparent reason. When I connected to the network with my laptop it seemed certain applications were asking for credentials even though I hadn't started them - (I could recognise the symbol that would appear in the taskbar at the same time the credentials dialogue box appeared). Does any one know what might be the cause and how I can resolve a very irritating problem... lol? Many thanks for any thoughts and guidance in advance.Steve

HI this is look like has a Kerberos issue. did you have some authentification failed in the security event log of your Domain controller ? Stef71

i think your isa in a domain.check the connectivity in between isa and dc. http://support.microsoft.com/kb/839509 you can also install ISA firewall client on the client computers http://www.microsoft.com/download/en/details.aspx?id=10193 Darshana Jayathilake