Strange Issue Migrating from SBS 2000 to Server 2003 R2

[Guest Bob Randall]

I have a strange issue that I need help with – here are the details:

 

I recently moved a small business office off of Small Business Server 2000

which was running as a DC, DNS Server, DHCP, and IS 2000. This office has 10

users, so I went the fully manual way. I took a new Windows 2003 R2 server,

built a new DC, and added DNS and DHCP services to it. I changed the Domain

name when I did it as well, because the person who created the initial SBS

2000 domain named it the

same as their registered domain name (which caused issues with the

externally hosted web site,etc). The SBS 2000 domain name was

special-tees.com, and I built the new domain as home.special-tees.com. I

also switched the IP addressing scheme from a 192.168.0.0 group on SBS 2000

to a 10.0.0.0 group on the new domain.

 

While both domains were running at the same time I went to each workstation,

removed them from the SBS 2000 domain, removed the ISA 2000 Firewall client,

removed them from the old domain and put them in a Workgroup, rebooted,

joined the new domain, renewed their IP addresses with DHCP on the new

Windows 2003 R2 server (10.0.0.0), and configured the workstations Apps, etc

….. I kept both domains running at the same time because I wanted to make

sure I properly removed each workstation for the old domain so no traces of

the old domain would be left behind. Since they are completely different IP

ranges, they were never using the same default gateway address. I did that

for all of the workstations and they are all communicating fine with one

another. I then demoted the old SBS 2000

server and removed the AD, DNS, and DHCP roles that it had.

 

Here is the issue – they are having intermittent internet connectivity

issues. If I unplug the two Ethernet cables from the ISA 2000 server (which

was acting as their Internet proxy before we migrated to the new Domain),

they have an intermittent internet connection. Sometimes it is really slow,

sometimes it if fine, sometimes they have no connection at all. If there is

no connection I can go to the ISA server, plug the cables back in, and the

Internet connection is back right away at full speed. If I leave it plugged

in, the same thing happens – the internet access degrades and becomes

intermittent. If I unplug them the internet connection comes back immediately

– then the same thing happens again. What is going on? There are two

different IP addressing schemes, none of the systems are pointing to the old

gateway AT ALL on the ISA 2000 server, but for some reason the clients are

occasionally trying to get to the internet via the old ISA server! Am I

missing something here? I even cleared the DNS cache from the workstations

and nothing …

 

Anyone have any ideas??

 

Bob