Outlook asking for username and password, but only for some users

Hello, I'm
in an Exchange Server 2013 client
environment, two CAS servers
and two Mailbox.
Some users are having trouble in Outlook 2007
and 2012, which is directly
requesting the user name and password, not all,
just some.
The Active Directory is ok,
DNS and also own Exchange
servers apparently do not see errors.
Has anyone here ever experienced this?
How can I solve this problem?
As this happens only to some users
and the vast majority have no problems, so
difficult to find the cause.
Thank you!
Ivanildo Teixeira Galvão

Hi Ivanildo,
From your description, only some users have an issue that Outlook prompts for username and password. In your case, I recommend you compare the normal and problematic Outlook settings. Here is the Outlook settings in my environment for your reference:
1. "Always prompt for logon credentials" isn't checked.
2. Logon network security using Negotiate Authentication.
3. "Connect to Microsoft Exchange using HTTP" is checked.
4. Use the NTLM Authentication when connecting to my proxy server for Exchange.
Hope this can be helpful to you.
Best regards,
If you have feedback for TechNet Subscriber Support, contact
[email protected]
Amy Wang
TechNet Community Support

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