Schneider Electric Exchange Community

Discuss and solve problems in energy management and automation. Join conversations and share insights on products and solutions. Co-innovate and collaborate with a global network of peers.

Register Now
Knowledge Base
cancel
Showing results for 
Search instead for 
Did you mean: 

Unable to open config pages on a web enabled controller that previously worked

Issue

Webpages were able to be viewed from controllers in the past but no longer work. The controller can be pinged which indicates that it is online.

Product Line

Andover Continuum

Environment

  • B4920
  • BCX
  • 99xx
  • Windows OS

Cause

If running the latest versions of Microsoft Office, there are a lot of extensions installed in the registry under accepted documents which create a very long string for a HTTP request.

Resolution

In a test environment, Microsoft Office suite 2007 was installed for testing. Webpages could be opened from the bcx and 9702 controllers but not from the b4920 or webpages on a 9900. The latest Microsoft Office packages added a few accepted document extensions that allow things like word docs and spreadsheets to be opened in Internet Explorer. If the extensions are removed, the docs and xls files can still be downloaded and can be opened locally instead of through the browser. The TCP streams below show the different http request.

Request with latest extensions:
GET / HTTP/1.1 Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash,
application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/xaml+xml,
application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, */*

Request with default extension:
GET / HTTP/1.1 Accept: */*

If running the latest versions of Microsoft Office, there are a lot of extensions installed in the registry under accepted documents which creates a very long string for a HTTP request. In order to work around this, you can edit the registry. Editing of the registry should be done with extreme caution. Be sure to export a copy of your registry.

  1. Look under the registry key
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Accepted Documents
  2. Then you can export all of the keys under the above location and delete all but the default key.
  3. Once this has been done, restart your browser and you should be able to open your controller's webpages.
Tags (2)
Labels (1)
No ratings
Contributors