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Simon George wrote: > Thanks everyone for the helpful feedback. > Back I go to network support then. Yes. Here are a few more things to show them :----------------------------- $ dig @dns1.rhbnc.ac.uk. -x 134.219.225.21 <FAILED> :----------------------------- $ dig @dns0.rhbnc.ac.uk. -x 134.219.225.21 Worked, i.e. ;; ANSWER SECTION: 21.225.219.134.in-addr.arpa. 86400 IN PTR storage001.ppgrid1.rhul.ac.uk. :----------------------------- So, the servers dns1.rhbnc.ac.uk and dns0.rhbnc.ac.uk give different answers to the same query. I'd look at dns1.rhbnc.ac.uk. If you want to see it all working, you could use: dig +trace -x 134.219.225.21 Steve -- Steve Jones [log in to unmask] System Administrator office: 220 High Energy Physics Division tel (int): 42334 Oliver Lodge Laboratory tel (ext): +44 (0)151 794 2334 University of Liverpool http://www.liv.ac.uk/physics/hep/