Multiple Exchange 2010 Issues

Hello all,

Having a few issues with an Exchange 2010 installation.

Outlook for some users is continually prompting for credentials.
Out of Office Assistant returns: "Your automatic reply settings cannot be displayed because the server is currently unavailable. Try again later."
Outlook runs fine when configured manually however sometimes the Exchange proxy settings change and this breaks Outlook.

This only affects users on 2010/2013, all users on 2003 are fine, so I'm assuming that it's all related to autodiscover.

Browsing to https://Exchange/autodiscover/autodiscover.xml displays the correct autodiscover page.
PlaiceAsked:
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Pete LongTechnical ConsultantCommented:
Is the proxy settings on the client set to, bypass proxy for;

https://Exchange/autodiscover/*

PL
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PlaiceAuthor Commented:
If you mean the proxy settings on the connection of the clients there is no proxy server in use.
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Rob ArmstrongOwnerCommented:
Check all of your URLs via a get-"....." command. Make sure everything is set correctly. This helped me a lot:
http://asifgohar.blogspot.com/2013/07/set-exchange-urls-owa-activesync-oab.html

Also, check what the default SSL and authentication settings should be for each virtual directory within your applicable exchange website in IIS
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PlaiceAuthor Commented:
All URLs are correct. These were checked this morning but have been double checked again just now.

SSL and authentication settings are also correct.
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Rob ArmstrongOwnerCommented:
hmm. Maybe set their IPs statically to confirm their IP settings are correct, or double check the DNS server they're hitting and make sure it has all the correct IPs. It's weird that it's only happening for a few users.

I assume they're all pulling the correct IPs though, since you prob already checked all that.
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PlaiceAuthor Commented:
Finally resolved
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