Hi,
Firstly can you please check if the connection tests for alias SAP_SRM are working ok. If not then check kba 1820417 - 'How to trace system connection test errors in the portal' to help determine the cause.
Did you run connector connection tests yet? Are they error free?
Please check the following for reference:
http://help.sap.com/erp2005_ehp_04/helpdata/en/92/a88931f2dd4631b9e8d530697d89c9/frameset.htm
Thanks
Lorraine