IIS 8.5 runtime error

Hi,

I'm new to IIS technology and need your detailed explanation and help please.

I have two servers have IIS 8.5 installed and using DNS round robin solution.  servers are 2012 servers.

my set up  for DNS A record and round robin is as below. All I did was created 2 A records pointing my site name with below IPs..  ( Hope not missing anything else. This is only for internal users)

 server1 IP =10.x.x.1   10.x.x.2 to use for the site  ( this is additional IP on the server)
 server2 Ip =10.x.x.3   10.x.x.4  to use for this site  ( this is additional IP on the server)

IIs is configured with its defaults except authentication settings. (Anonymous is disabled and windows authentication is enabled)
Did not made any change to physical directory for permissions? (inetpub folder)
not all the users but 2 out of 1 user is receiving attached error. Can you please tell me where to look for more information and also what to do by step by step please? Thanks for your help.
kuzumAsked:
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KimputerCommented:
Attachment? 2 out of 1, is consistent? The same user with the error ALWAYS gets the error, even after trying multiple times? Or you mean the same user has the problem about 50% of the time?
kuzumAuthor Commented:
sorry attached the error,  yes, the same user gets the error. I just noticed that any user receiving ping response from site link that is hitting  server2 is having the attached error. seems issue is more around server2?
Capture.PNG
kuzumAuthor Commented:
checked the differences between both servers and noticed that on the server2(which I believe problematic one)

from site properties>edit permission>security   I cannot see authenticated users groups?? do you think this is compulsory to have on both servers?
thanks
KimputerCommented:
Both should be on the same domain, and have permissions matching.

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Microsoft IIS Web Server

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