LDAP problem?

[Tannv]

I have setup a win2K server with 2 Nics, 1st connect to LAN, 2nd connect to router cisco and to Internet(through ISP). The 2nd Nic only open ports: 25,110,80,389,119,8080,42.
When I tried connect to a LDAP server to find some people on Internet then returned error"server could not be reached or unavailable". But I tried connect through Dial-up to ISP then OK.
May I need open more ports?

Pls. help me to fix it.
Thanks in advance.

 

[greg013]

By default, LDAP uses port 386; LDAP (SSL) uses port 636.

Are you trying to login to this server? Login sequence uses UDP ports 137 and 138, and TCP port 139.