Getting 500 internal server error for API connect on Bluemix - ibm-cloud

We are getting below error while using Bluemix API Connect service. The same service was working fine few days back.
Error Message:
root request.py invoke_request: Response is: { "httpCode":"500", "httpMessage":"Internal Server Error", "moreInformation":"Failed to establish a backside connection" }
Thanks in advance.

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profile=urllib2.urlopen("https://www.graph.facebook.com/v2.0/me?access_token="+access_token)
In this code error=
'An error occured while connecting to the server: %s' % e) error: An
error occured while connecting to the server: DNS lookup failed for
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The IP of the host you are connecting to cannot be resolved. See my answer in
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