i have downstream wsus server 2008 r2. when it is trying to sync to upstream server getting error message (please see below).
The message seems pretty clear to me:
Unable to connect to the remote server. A connection attempt failed because the connected party did not properly respond after a period of time, or [an] established connection failed because [the] connected host has failed to respond.
So the first objective is to determine which is it... did the target server never answer the phone, or did the target server get distracted by something else and forget about the source server's connection? Start by reviewing the IIS logs.
Are there inbound connection attempts from the downstream server. If not, then figure out where the connection attempt is going to.
Maybe you have an incorrect URL?
Maybe DNS is not working?
Maybe a router is dropping packets?
Maybe a router is congested?
Maybe the upstream server is too busy?
Maybe the upstream server is just slow and performing poorly?
Lawrence Garvin, M.S., MCITP:EA, MCDBA, MCSA
Product Manager, SolarWinds Microsoft MVP - Software Distribution (2005-2012)
My MVP Profile: http://mvp.support.microsoft.com/profile/Lawrence.Garvin