Net8 Error -- ORA-12535 Time Out

Question

Here's the situation:
I have 2 8i Enterprise Servers, S1 and S2.
For purposes of simplicity, I have 2 Clients C1 and C2.
Using SQLPLUS, as one would expect, I can connect to S1 from C1, C2, and S2.
Problem: Cannot connect to S2 from C1, C2, or S1 -- Get ORA-12535 TNS Operation Timed out.
On S2:
-- The S2 db is up.
-- Can successfully perform a Net8 Config Assistant test on S2 but not from the clients.
-- Can perform a tnsping from the clients to S2. Network is up. Client sees the S2 listener.
Any suggestions? Email should read [email protected]
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Answer 1

As a follow-up -- the problem had to do with a change made to the NT network configuration -- Changing from DHCP to a fixed IP address.
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