Integration Gateway - External System Contact Error (158,10721)

ISSUE DESCRIPTION :

Last week we refreshed our test environment from Production. Integration broker is working fine, nodes are pinging,gateway is ok. But peopletools>Search Framework>Administration>Search Instance, search engine details we filled correctly but while pinging it gives below error.

Integration Gateway - External System Contact Error (158,10721)

Integration Gateway was not able to contact the external system.  The network location specified may be incorrect, or the site is permanently or temporarily down.

SES server we bounced, it looks all ok. errorlog.html is having error that

>java.net.UnknownHostException: The host couldn't be resolved.</Parm></Parameters><DefaultTitle>Integration Gateway Error</DefaultTitle></Status></IBInfo>

SOLUTION:

Navigate to Gateways - Gateway Setup Properties - - Advanced Properties Page and search for ig.proxyHost. Make sure that ig.proxyHost and ig.proxyPort are commented. Restart the webserver and retest

                        OPatch failed with error code = 73

Failed to load the patch object. Possible causes are:
  The specified path is not an interim Patch shiphome
  Meta-data files are missing from the patch area
  Patch location = C:\Download\11.1.1.5.0_2012_04_13_1646_oPath
  Details = PatchObject constructor: Input file "C:\Download\11.1.1.5.0_NNNN_oPath\etc\config\actions" or "C:\Download\11.1.1.5.0_NNNN_oPa
th\etc\config\inventory" does not exist.

ApplySession failed: PatchObject constructor: Input file "C:\Download\11.1.1.5.0
_NNNN_oPath\etc\config\actions" or "C:\Download\11.1.1.5.0_NNNN_oPath\etc\config\inventory" does not exist.
System intact, OPatch will not attempt to restore the system

OPatch failed with error code = 73


Answer :

Make sure you are navigating to the actual extracted patch directory and from there you run 
opatch apply