401 Unauthorized Page Not working in SharePoint.

Question

When a bad log-in is entered three times while opening a SharePoint Site, "401 Unauthorized"page is not reached but SP site returns a blank page.
Its SP 2010 Environment with Windows Server 2008 R2 and IIS 7.
Please share your thoughts in resolving this issue.
Thank you. 

Answer 1

Disable the authentication loopback check
Reference: https://support.microsoft.com/kb/926642/en-us?wa=wsignin1.0
Re-enable the behavior that exists in Windows Server 2003 by setting the DisableLoopbackCheck registry entry in the
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa registry
subkey to 1. To set the DisableLoopbackCheck registry entry to 1, follow these steps on the client computer:
Click Start, click Run,
type regedit, and then click OK.
Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
Right-click Lsa, point to New,
and then click DWORD Value.
Type DisableLoopbackCheck, and then press ENTER.
Right-click DisableLoopbackCheck, and then click Modify.
In the Value data box, type 1,
and then click OK.
Exit Registry Editor.
Restart the computer.
Note You must restart the server for this change to take effect. By default, loopback check
functionality is turned on in Windows Server 2003 SP1, and the DisableLoopbackCheck registry entry is set to 0 (zero). The security is reduced when you disable the authentication loopback check, and you open the Windows Server 2003 server for man-in-the-middle
(MITM) attacks on NTLM.
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Thanks, ShankarSingh(MCP)