Failed to register a web service portlet provider

Hi,
I'm trying to register a portlet provider in Portal 11g. however, the following error was returned. Is there anyone can help? Thanks.
WSDL URL: http://host:port/webapp6/portlets/wsrp2?WSDL
Error
===
Internal error (WWC-00006)
Unexpected error - User-Defined Exception (WWC-35000)
An error occurred during the call to the WSRP Provider: java.rmi.RemoteException: ; nested exception is:
HTTP transport error: java.io.InterruptedIOException: recv() timed out
A non-blocking socket operation could not be completed immediately.
Java stack trace from root exception:
HTTP transport error: java.io.InterruptedIOException: recv() timed out
A non-blocking socket operation could not be completed immediately.
at oracle.webdb.wsrp.client.BaseHTTPClientTransport.invoke(Unknown Source)
at oracle.j2ee.ws.client.StreamingSender._sendImpl(StreamingSender.java)
at oracle.j2ee.ws.client.StreamingSender._send(StreamingSender.java:110)
at oracle.webdb.wsrp.v2.runtime.WSRP_v2_ServiceDescription_Binding_SOAP_Stub.getServiceDescription(Unknown Source)
at oracle.webdb.wsrp.client.design.v2.OraWSRP_v2_ServiceDescription_PortType.getServiceDescription(Unknown Source)
CAUSE:
java.io.InterruptedIOException: recv() timed out
A non-blocking socket operation could not be completed immediately.
at oracle.webdb.wsrp.client.BaseHTTPClientTransport.invoke(Unknown Source)
at oracle.j2ee.ws.client.StreamingSender._sendImpl(StreamingSender.java)
at oracle.j2ee.ws.client.StreamingSender._send(StreamingSender.java:110)
at oracle.webdb.wsrp.v2.runtime.WSRP_v2_ServiceDescription_Binding_SOAP_Stub.getServiceDescription(Unknown Source)
at oracle.webdb.wsrp.client.design.v2.OraWSRP_v2_ServiceDescription_PortType.getServiceDescription(Unknown Source)
Caused by: java.io.InterruptedIOException: recv() timed out
A non-blocking socket operation could not be completed immediately.
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at HTTPClient.BufferedInputStream.fillBuff(BufferedInputStream.java:172)
at HTTPClient.BufferedInputStream.read(BufferedInputStream.java)
at HTTPClient.StreamDemultiplexor.read(StreamDemultiplexor.java)
at HTTPClient.RespInputStream.read(RespInputStream.ja (WWC-43273)

Finally I restore both Portal 11g and SSO 10g from backup images and the portlets can be resigtered succesfully. It seems that something is corrupted.

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