*Update*

The problem has been identified and addressed. Domain lookups are now working so KGH services should be available from Queen's campus.
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Previous Description (2012-07-13 12:20:23):

Domain Name Systems lookups for kgh.on.ca are currently not working. Users are unable to access the www.kgh.on.ca or the Citrix Access Gateway (CAG).

IT Services staff are investigating the issue.