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401 - Error

I am getting the following error all of a sudden for a web page that is configured with an API for SOAP calls:

401 - Unauthorized: Access is denied due to invalid credentials.

You do not have permission to view this directory or page using the credentials that you supplied.

Has anyone experienced this issue?
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amazon4life
Asked:
amazon4life
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1 Solution
 
loftywormCommented:
A hundred times.  Need more details though.  Is it supposed to be anonymous?  Are there supposed to be creds?  Is the free to the world, or intranet?
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amazon4lifeAuthor Commented:
Not supposed to be anonymous, and yes there are IIS credentials via a domain account and an API account, generating SOAP calls within the web.config.  Not on the internet, only intranet.  I need to verify TLS is not on 1.0 but on 1.1 or higher.  Have you done this before?
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loftywormCommented:
Yes.  
You may find some more enlightening logs here
https://msdn.microsoft.com/en-us/library/aa558762.aspx

Also, have you checked the standard stuff?  the account is not locked out or expired password.  The certificates AND path are correct and working?
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loftywormCommented:
You can find the TLS information in the certificate details
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amazon4lifeAuthor Commented:
Thanks, I'll check the link.  Yes, I checked the standard stuff, testing authentication via IIS successfully, even tried granting Authenticated Users access via Security Group tab, account is active and the password has not expired.
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loftywormCommented:
There may be something in the Security event log as well, as to what account is failing.  

I have also seen creds connected to the application pools, may need to look there.
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