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HTTP Error 401.2 on subdomain

hamed23100

Regular Pleskian
Hi,

on plesk 11 one of my sites had some subdomains, suddenly subdomains prompt for password, I ran following commands:

websrvmng.exe --remove-vhost --vhost-name=Domain.tld
websrvmng.exe --reconfigure-vhost --vhost-name=Domain.tld

command finished successful but didnt solved the problem, I run them several times and same result, finally i solve it with following:
RDP to server, IIS>>Sites>>subomain.domain.tld>>authentication>> then select anonymous authentication, then edit>> change to application pool identity

now i want to know why it does not work with specific user (IUSR_Domain_user) ?
it is strange this problem is just for this domain! how can i revert it to back to work with IUSR_Domain_User ?
 
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