RE: LDAP connections to the proper server, and unknown error??

PING tests that your TCP/IP stack is able respond to IP control 

messages 

(ICMP protocol).  I have no clue what that has to do with LDAP.  I guess 

it shows that the network adapters in the machines have been 

successfully 

configured, which is something, but not very much. 

It also shows that the two machines are on the same subnet, or at least 
that routing between them is working.  The reason I suggesting ping in the 
first place is that it sounded to me like there may be a problem with the 
iSeries being on the internal network and the mail server being on the DMZ 
or something like that.

TELNET would give you 
a more accurate test of whether the LDAP port is responding than PING 
does.

Which is why I suggested TELNET once it had been established that the two 
machines could indeed access one another.  Now that Alan seems to be stuck 
with hitting the LDAP server, but either getting authentication failures 
or empty result sets, this seems to be a moot point.  After skimming the 
RFCs for LDAP v2 and v3, it seems that debugging the connection using 
TELNET would be a big pain, as the LDAP messages are fairly complex (at 
least compared to other protocols I've used over telnet, like SMTP and 
POP3).  Alan, if you are stuck it may still be worth doing, if only to 
gain insight into what the LDAP protocol really does 'under the hood'. See 
http://www.mozilla.org/directory/standards.html for links to the LDAP v3 
specifications.

Alan, perhaps you could check with the LDAP admin to see if s/he can watch 
the logs for failed authentications while you try your program.  It may 
lead to something ... maybe it is something as simple as incorrect 
upper/lower case?

HTH,
Adam
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