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ICMP: Port Unreachable error


I installed OpenLdap on a RH7.1 linux box and everything works fine, as long
as I 'stay' on that box. As soon as I want to connect from an other box I
get an ICMP 'port unreachable' error although `netstat -an` tells me that
somebody is listening on port 389!

My gut feeling is that I missed a security setting somewhere but I can not
figure out where. I looked through all the manuals, docs, FAQs, etc. I could
get my hands on but no luck so far.

Any help is highly appreciated.