We have a small single domain network - vanilla MS stuff - with an ISA 2004 gateway. Clients use IE and Firewall clients.
It was all connected via unmanaged T100 'superstack' hubs but at the weekend I replaced everything with T1000 switches.
Since then I've had problems.
The clients will very frequently (say, once at hour at least) slow right down or get the ISA webpage unreachable '404' type page.
A restart of the ISA Services sorts it. It's very quick again ... for a while.
I get this even with a client that's directly connected into the same T1000 switch as the ISA Server.
Now, i'm a notive with this stuff - and no firewall expert, so I'm a bit stuck.
As these switches have IP addresses - do you think there is some sort of routing problem? Does/should ISA rebuild the routing tables?
I really can't think what else has changed ... but it's is a REAL problem for me ... any help would be appreciated as I don't know where to start. I've checked the obvious - DNS etc and everything is resolving well. There are no errors in any event logs that I can see.
Kind of desperate ... many thanks ...