problem with xi cache

Hi,

SLD is working fine but i have problem in xicache

When i go to SXI_CACHE it is showing red when selected

"START DELTA REFRESH"

I am getting error as

error category : communication

"cl_HTTP_client_RFC_READ_HTTP_DESTINATIONAUTHORITY_NOT_AVAILABLE"

In RWB in component monitoring Integration Server is showing yellow with message "Is web service security avaliable"

Please suggest

Thanks

Abdul