The kerberos client received a KRB_AP_ERR_MODIFIED error from the server
The article helps you to resolve the issue that the kerberos client received a KRB_AP_ERR_MODIFIED error from the server.
Applies to: Windows Server 2003
Original KB number: 558115
During access to NLB virtual IP/NLB Virtual Name, the user may prompt to a username and password, and the following error may add to the local system event log:
Event ID: 4
"The kerberos client received a KRB_AP_ERR_MODIFIED error from the server host/myserver.domain.com. This indicates that the password used to encrypt the kerberos service ticket is different than that on the target server. Commonly, this is due to identically named machine accounts in the target realm (domain.com), and the client realm. Please contact your system administrator."
During access to the IIS 6 web site that support Windows Integrated Authentication, the following issues may occur:
- Mismatch DNS name resolution. The issue is common in an NLB environment that uses multiple IPs or network adapters.
- The user doesn't have a Local NTFS access permission.
- The Web Site is using Application Pool with a poor permission setting.
To resolve the error issue, consider to implement the following tests:
Verify that the IIS has been set up with correct NTFS settings.
Integrated Windows Authentication (IIS 6.0)
Verify that each cluster node has been set up with correct DNS settings.
Verify that the node has been set up with correct Application Pool settings:
Configuring Application Pool Identity with IIS 6.0 (IIS 6.0)
Verify that internet explorer has been set up with a correct security setting.
Authentication and Access Control Diagnostics 1.0 (x86)
Internet Information Services Diagnostic Tools
Community Solutions Content Disclaimer
MICROSOFT CORPORATION AND/OR ITS RESPECTIVE SUPPLIERS MAKE NO REPRESENTATIONS ABOUT THE SUITABILITY, RELIABILITY, OR ACCURACY OF THE INFORMATION AND RELATED GRAPHICS CONTAINED HEREIN. ALL SUCH INFORMATION AND RELATED GRAPHICS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT AND/OR ITS RESPECTIVE SUPPLIERS HEREBY DISCLAIM ALL WARRANTIES AND CONDITIONS WITH REGARD TO THIS INFORMATION AND RELATED GRAPHICS, INCLUDING ALL IMPLIED WARRANTIES AND CONDITIONS OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, WORKMANLIKE EFFORT, TITLE AND NON-INFRINGEMENT. YOU SPECIFICALLY AGREE THAT IN NO EVENT SHALL MICROSOFT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY DIRECT, INDIRECT, PUNITIVE, INCIDENTAL, SPECIAL, CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF USE, DATA OR PROFITS, ARISING OUT OF OR IN ANY WAY CONNECTED WITH THE USE OF OR INABILITY TO USE THE INFORMATION AND RELATED GRAPHICS CONTAINED HEREIN, WHETHER BASED ON CONTRACT, TORT, NEGLIGENCE, STRICT LIABILITY OR OTHERWISE, EVEN IF MICROSOFT OR ANY OF ITS SUPPLIERS HAS BEEN ADVISED OF THE POSSIBILITY OF DAMAGES.