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D [26/Oct/2006:07:27:39 -0400] cupsdAcceptClient: 9 from localhost (Domain)
D [26/Oct/2006:07:27:39 -0400] cupsdReadClient: 9 POST /admin/ HTTP/1.1
D [26/Oct/2006:07:27:39 -0400] cupsdAuthorize: No authentication data provided.
D [26/Oct/2006:07:27:39 -0400] CUPS-Add-Modify-Printer ipp:///var/run/cups/cups.sock/printers/TEST
D [26/Oct/2006:07:27:39 -0400] CUPS-Add-Modify-Printer client-error-bad-request: The printer-uri must be of the form "ipp:/
/HOSTNAME/printers/PRINTERNAME".
D [26/Oct/2006:07:27:39 -0400] cupsdProcessIPPRequest: 9 status_code=400 (client-error-bad-request)
D [26/Oct/2006:07:27:39 -0400] cupsdCloseClient: 9

So, it looks like CUPS doesn't like "/var/run/cups/cups.sock" as HOSTNAME.