Today I found that I can't aceess help on system tools through "Tool Help" button. It opens help window which says:

Can’t reach this page

  • Make sure the web address //ieframe.dll/dnserrordiagoff.htm# is correct
  • Search for this site on Bing
  • Refresh the page

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I am afraid it is Windows October update in action. Does anybody know how to fix this?

I tried profile reset and repair installation, no luck.

It is Windows 10 I worry about. The October update was delayed, because it was deleting files on PCs.


I always use the Web rather than Desktop Help but I just tested the latter to see if I could reproduce what you describe in my configuration (which received 11 Windows updates on 10 Oct 2018).

On Windows 7 SP1, using ArcGIS Desktop 10.6, the Desktop Help starts fine from the Windows Start Menu, and I seem to be able to use that to navigate to any of its pages.

enter image description here

However, when I use the Tool Help button from any geoprocessing tool:

enter image description here

I get the same as you:

enter image description here

so I think you should report this to the Technical Support of your Esri International Distributor.


Same error on my side. Even with newest version of ArcGIS 10.6.1 with Windows 7 64Bit SP1.

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  • Do you mean ArcGIS Desktop 10.6.1? What version of Windows did you test on? – PolyGeo Oct 18 '18 at 21:07
  • Please use the edit button beneath your answer to revise it with any requested clarifications. Please check out our short tour to learn about our focussed Q&A format. – PolyGeo Oct 18 '18 at 21:49
  • Still no reply for my GIS support request 5 days ago. – FelixIP Oct 18 '18 at 22:08

Solution posted on GeoNet did the trick. Answer by cringo at the bottom of that post is the one.

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