I have 3 main problems n im using a single thread for it.

1) Networkin Problem: -

I have a network with a WIN2K Server and 15 clients WIN98. (Seems to be a pretty stupid network ) ANyway the server has both DHCP and DNS installed and obviously AD. The problem is that he clients are unable to find DHCP server the DNS is workin fine. When i check IP configuration of clients its showing the DNS entry there. But on DHCP just the broadcast address.
Since the DHCP is not workin so the clients get the IP Automatic assigned that 169.... series. I have created the users accounts in the AD. One more thing one i try to logged into the Domain from the clients i received the message that no DNS server is there to authenticate or ....... When i checked the help file. Its says when the clients dont find DHCP this message will appear.

I have check the log files no error message is there or rather there is no service which is clashing over. Can anyone tell me where the problem is... Im using 10.0 series address. One more thing im using ISA server in integerated mode on the server.

2) Problem With Gateway Configuration: -

In this network the server and clients are of WIN98. The network has a Cable net line which i want to share. Heres the configuration of the network:-
Server:-

LAN CARD 1 : Main Line or cable line with Static IP 192.168.1.24
LAN CARD 2 : Internal network with IP 10.0.0.1
Gateway define on the card 1 is the server IP address which is 192.168.1.1. The problem is with the gateway of the card 2 here when no gateway is defined then sharing is done using CCProxy n when i use the gateway of the server 192.168.1.1 the networks dont work

Is this the right configuration casue i have doubt abt this.
One more thing Wingate is not workin alright here, the clients r getting gatewat timout request.


3) Problem With ISA Server 2004: -

This is the most important issue that i must mention here and for which i need comments and help frm u ppl. On the server ISA 2004 is running and WIndows 2000. No DHCP, AD and DNS. Clients are WIN98. The problem is actually on client side. When we start the server every service and application runs fine including YAHOO Messenger. After around 1 hour or 45 mins. when we close the yahoo messenger then the clients are unable to open the yahoo messenger. You can see it running in the background and icon will be in the tray but u cant open it. So all u have to do is to restart the computer which is really irretating.

With same hardward and OS ISA server 2000 was running fine. ISA configuration is fine cause i have even checked it with default options and configuring manually.

Well the problem has been rectified but the solution is just not acceptable or doesn't satisy us. What we have done is that we change the clients we have use the clients of ISA 2000. I mean the ISA server is 2004 but clients are 2000 one. Now no such problem is there.

Tell me wht could be the problem with this ISA 2004.