Grid control agent can NOT upload data to OMS server through firewall

we have OMS server (Grid control version 10.2.0.3)
outside firewall, but database servers inside
firewall.  We already open following three ports on
firewall:

4889
7200
3872

We still can NOT upload data from agent (10.2.0.3) to
OMS server.  I check log file on
sysman/log/emagent.trc and found following messages:

2007-05-10 13:55:21 Thread-39222192 ERROR pingManager:
nmepm_pingReposURL: Did not receive a response header
from repository
2007-05-10 13:55:49 Thread-39222192 ERROR upload:
Error in uploadXMLFiles.  Trying again in 900.00
seconds or earlier.
2007-05-10 13:55:51 Thread-39222192 ERROR pingManager:
nmepm_pingReposURL: Did not receive a response header
from repository
2007-05-10 13:55:51 Thread-39222192 ERROR pingManager:
nmepm_pingReposURL: Did not receive a response header
from repository


does there has any other port we need opne on firewall
or else?

Thanks.


 
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