Bad Request when loading ECP on Exchange 2010

When I or any other user try to open webmail.domain.dk/ecp we are redirected to the Language selection page and when clicking Ok we get a "Bad request" and the address bar shows https://webmail.domain.dk/owa/lang.owa.

As far as I can see, it is because of the mailboxregionalConfiguration which is set to danish.
[PS] C:\tools>Get-MailboxRegionalConfiguration kasper

Identity             Language        DateFormat TimeFormat TimeZone
--------             --------        ---------- ---------- --------
                     da-DK           dd-MM-yyyy HH:mm

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What is going on here? How do I get into ECP again. I have to keep the regional settings.

Any help is appriciated.
Kasper KatzmannSeniorkonsulentAsked:
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Rodney BarnhardtServer AdministratorCommented:
You could try a reset of the virtual directory.

set-OwaVirtualDirectory "owa (default web site)" -DefaultClientLanguage 0
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Kasper KatzmannSeniorkonsulentAuthor Commented:
It didn't help. I gor this instead:

[PS] C:\Windows\system32>Set-OwaVirtualDirectory -identity "Owa (Default Web Site)" -DefaultClientLanguage 0 -LogonAndErrorLanguage 0

WARNING: The command completed successfully but no settings of 'CAS2\owa (Default Web Site)' have been modified.

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Rodney BarnhardtServer AdministratorCommented:
Does your external link for OWA exactly match the ECP link path? If not, then ECP will not work correctly. The paths must match up to the /ecp or /owa. If you correctly match the paths this should work fine. Do the paths match?
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Kasper KatzmannSeniorkonsulentAuthor Commented:
They match just fine (unfortunately)
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Rodney BarnhardtServer AdministratorCommented:
That is strange, because your problem sounds just like this one.

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_27572683.html
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Kasper KatzmannSeniorkonsulentAuthor Commented:
Latest update:
It now seems that for some users it is working, but for others it don't.
That doesn't make it any less strange, but baybe it can give you some clue...
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Kasper KatzmannSeniorkonsulentAuthor Commented:
It was due to missing timezone´information on those users. When I updated them to use the same timezone as the rest of the organization, it worked. Problem solved.
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Kasper KatzmannSeniorkonsulentAuthor Commented:
It was due to missing timezone information on those users. When I updated them to use the same timezone as the rest of the organization, it worked. Problem solved.
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