Scenario:
Calling DLL via web services (with connection string defined in web service table) on 3-tier configuration (navision client, application server and database to three machines) returns HTTP400 error; on 2-tier environment web services runs correctly.
Error Message:
The Kerberos client received a KRB_AP_ERR_MODIFIED error from the server monmau. The target name used was HTTP/servernav2015.lan1.local. This indicates that the target server failed to decrypt the ticket provided by the client. This can occur when the target server principal name (SPN) is registered on an account other than the account the target service is using. Ensure that the target SPN is only registered on the account used by the server. This error can also happen if the target service account password is different than what is configured on the Kerberos Key Distribution Center for that target service. Ensure that the service on the server and the KDC are both configured to use the same password. If the server name is not fully qualified, and the target domain (lan1.local) is different from the client domain (lan1.local), check if there are identically named server accounts in these two domains, or use the fully-qualified name to identify the server.
link I found
http://blogs.technet.com/b/dcaro/archive/2013/07/04/fixing-the-security-kerberos-4-error.aspx
https://social.technet.microsoft.com/Forums/windowsserver/en-US/f8a93cde-f1de-47b6-b85a-781c795825f7/kerberos-event-id-4-krbaperrmodified?forum=winserverDS
http://www.mibuso.com/forum/viewtopic.php?f=32&t=61433&view=previous
https://support.microsoft.com/en-us/kb/558115
Thanks for support.
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