RPCPing Error 122 returned in the WinHttpSetCredentials.

When i do RPCping test to the Exchange 2010 server, system said error 122 as below.
Any idea what error code 122 means and how to fix it?
Thank you.

RPCPing v2.12. Copyright (C) Microsoft Corporation, 2002
OS Version is: 6.1, Service Pack 1

RPCPinging proxy server mail.rshi.hk with Echo Request Packet
Checking IE setting...
The proxy setting is disabled.
Error 122 returned in the WinHttpSetCredentials.
Ping failed.

C:\Program Files\Windows Resource Kits\Tools>
dickchanAsked:
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Rodney BarnhardtConnect With a Mentor Server AdministratorCommented:
Are you trying to pass through a firewall. I believe the error 122 refers to a buffer size problem.
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dickchanAuthor Commented:
Same result if when testing in the local network with firewall turned off.

RPCPing.exe /t ncacn_http /o RpcProxy=mail.mydomain.com /u 10 /a connect /v 3 /E /P “username,domain,passowrd” /H 1 /F 3 /b
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Rodney BarnhardtServer AdministratorCommented:
Is this a single server, or do you have some load balancer in front of the servers(s)?
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