Click Start, click Run, type regedit, and then click OK.
2. Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\W3SVC\Parameters
3. On the Edit menu, point to New, and then click DWORD Value.
4. Type EnableKerbAuthPersist for the entry name, and then press ENTER.
5. Right-click EnableKerbAuthPersist, and then click Modify.
6. In the Value data box, type 1 or any nonzero value to enable the hotfix, and then click OK.
Note To return the IIS service to the default behavior, set the value to 0.
7. Exit Registry Editor.
8. Restart the IIS service. To do this, follow these steps:
a. Click Start, click Run, type cmd, and then click OK.
b. Type the following commands. Press ENTER after each command:
net stop iisadmin
net start iisadmin
Mod_auth_kerb is an Apache module designed to provide Kerberos authentication to the Apache web server. Using the Basic Auth mechanism, it retrieves a username/password pair from the browser and checks them against a Kerberos server as set up by your particular organization. The module also supports the Negotiate authentication method, which performs full Kerberos authentication based on ticket exchanges, and does not require users to insert their passwords to the browser.