HELP net8 on NT very slow

Help, I have some serious trouble connecting from a NT Client (8.0.4) to a 8.0.4 server. The client machine connects through an ISDN modem. Standard ping is fine, tnsping <db-alias> is fine, but tnsping<host-ip> takes minuttes before attempting to connect, then connects fine!. My application takes forever to connect.

I am not sure where to search for the problem? Client or host? Why is tnsping<host-ip> so slow?
Any ideas?

Thanks
Peter

Scenario:
1) ping <host-ip> indicates fine connection (approx 60 ms connection), no delays
2) tnsping80 <db-alias> indicates fine connection, no delays 3) tnsping80 <host-ip> has a very long delay (several minuttes) before it displays the text: Attempting to contact ... and then indicates a fine connection???
4) sqlplus takes a minute or more to establish a connection, however when connected select speed is fine
5) An application opening several sessions and selecting some data takes 20-30 minuttes or more initialising!! Received on Wed Jun 02 1999 - 08:18:56 CDT