If you receiver the error "Authentication failed because the remote party has closed the transport stream" when accessing "Search Settings" in the SSP, the following steps will resolve the issue. The issue is a result of incorrect self-serving-certificate.
1. Install the IIS 6.0 Resource Kit on the index server (http://www.microsoft.com/downloads/details.aspx?FamilyID=56fc92ee-a71a-4c73-b628-ade629c89499&DisplayLang=en)
2. Assign a new SSL certificate to the Office SharePoint Server Web Services site on the index server using the SELFSSL tool from the resource kit.
SELFSSL.EXE /N:CN=<name of index server> /K:1024 /V:<number of days cert should be valid> /S:951338967 /P:56738
The /S and /P parameters specify the web site ID and port number, respectively, of the Office SharePoint Server Web Services site in IIS. They should be set to the appropriate values for your environment.