Unable to retreive cenos repo data

Hello There,

i'm unable to retrieve packages from OpenLogic CentOS repositories.I found a related topic here, but there is no description/resolution of the mentioned problem. btw: location Western Europe.

http://olcentgbl.trafficmanager.net/centos/6/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'olcentgbl.trafficmanager.net'"
Trying other mirror.
http://olcentgbl.trafficmanager.net/centos/6/os/x86_64/repodata/filelists.xml.gz: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'olcentgbl.trafficmanager.net'"
Trying other mirror.
Error: failure: repodata/filelists.xml.gz from base: [Errno 256] No more mirrors to try.

Thanks for the answer in advance.