$cfg{DefaultUrlHost} ='https://externalurl.com';

$cfg{ScriptUrlPath} = '/go/department/twiki/bin';

$cfg{PubUrlPath} = '/go/department/twiki/pub';

This setting works fine for the wiki, but with configure i can not go to the next page. it just goes to http://twiki/bin/configure.

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That's correct. configure is designed to work relative to the original URL used to invoke it. It does not (cannot) use the DefaultUrlHost - after all, that is one of the things it is expected to configure! CC

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Also the graphics are not working in configure.

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Can you be clearer about this? Do you mean the logo in the top left corner? CC

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When using the normal wiki i get logmessages like [Mon Jan 30 15:15:48 2006] [notice] cannot use a full URL in a 401 ErrorDocument directive --- ignoring!

This does also sound not correct.

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No, it sounds like you have you ErrorDocument setting wrong in Apache. That's nothing to do with TWiki. CC

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from TWiki:Support.ConfigureNotWorkingWithProxy

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There is no error report here that I can see. Discarding. if necessary, re-open with a specific error description and testcase.

CC