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I've setup the whole SharePoint 2013 App Domain stuff many times on different configurations without issues, but now I have one customer installation with some weird behaviour.

If I start an App installed in the hostweb, I get the credentials Dialog for Authentication. I'd expect automatic Authentication. I tried quite a bit, but to no success. Yesterday I found an interesting solution to it. As long as Fiddler is running on my Client, Authentication works as expected.

What does Fiddler do? Any ideas what causes that behaviour?

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I fixed this issue by changing authentication for the "catchall/app" web from negotiate to NTLM. I´m still not sure what fiddler does so it works, but at least apps work as expected. An error in chrome "Invalid Auth Credentials" pointed me in the right direction.

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