Also have you tried pinging the IP to make sure its valid and can be accessed? Are you running any kind of firewall on the system you are trying to access?

dougc

Symeon Breen wrote:
Is unirpcd licenced and running on the u2 server ?   also try putting the
full path to the u2 account instead of just TALK2UDT.






-----Original Message-----

From: u2-users-boun...@listserver.u2ug.org
[mailto:u2-users-boun...@listserver.u2ug.org] On Behalf Of Charles Carroll
Sent: 05 April 2010 15:16
To: u2-users@listserver.u2ug.org
Subject: [U2] OpenSession throwing 81011 error

            UniSession us = null;
            try
            {
                // us = UniObjects.OpenSession("10.10.10.10",
"userid", "password", "TALK2UDT","ud");
                us = UniObjects.OpenSession("10.10.10.10", "userid",
"password", "TALK2UDT");

            }


SocketException caught!!!SystemNo such host is known[IBM U2][UODOTNET
- UNIRPC][ErrorCode=81011] The host name is not valid, or the host is
not responding Source: UniRPCConnection Class Method: Void
set_Host(System.String)   at
IBMU2.UODOTNET.UniRPCConnection.set_Host(String value)
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