The related details are listed as follows:
With “Domain” is work in previous UAT environment. And now we can’t (we need to remove the “Domain” in “NetworkCreadential“ method).
With “Domain” is work in PDN environment.
“DefaultNetworkCredentials” or “DefaultCredentials” or "System.Net.CredentialCache.DefaultCredentials" is doesn’t work in UAT environment (Throw Error: The request failed with HTTP status 401: Unauthorized).
I have tried restarting both IIS and the application pool but this does not help.
IIS Setting:
Anonymous Authentication is Enabled
Windows Authentication is Enabled
Authorization Rules is set up to Allow All Users
In the IIS log I can see the following:
2020-07-08 08:05:09 POST /_vti_bin/Lists.asmx - 80 0#.w|asia2\xxxx Mozilla/4.0+(compatible;+MSIE+6.0;+MS+Web+Services+Client+Protocol+4.0.30319.36543) 200 0 0 62
2020-07-08 08:06:19 GET /sites/intranet/TC/_vti_bin/Lists.asmx - 80 - Mozilla/4.0+(compatible;+MSIE+7.0;+Windows+NT+6.1;+WOW64;+Trident/5.0;+SLCC2;+.NET+CLR+2.0.50727;+.NET+CLR+3.5.30729;+.NET+CLR+3.0.30729;+InfoPath.3;+.NET4.0C;+.NET4.0E)
401 1 2148074254 0
