I've just upgraded my Exchange 2000 FE server to Windows 2003/Exchange 2003. My BE servers are all Exchange 2000 still. I'm now getting this error in my App Log on the FE server and cannot figure out why. Can someone shed some light on this? Event Type: Warning Event Source: EXPROX Event Category: None Event ID: 1000 Date: 8/25/2004 Time: 1:32:51 PM User: N/A Computer: WEBMAIL Description: Microsoft Exchange Server has detected that NTLM-based authentication is presently being used between this server and server 'EXCH1'. NTLM is still a secure authentication mechanism and protects users' credentials. However, this indicates that there may be a configuration issue preventing the use of Kerberos authentication. If this condition persists, please verify that server 'EXCH1' is properly configured to use Kerberos authentication. After applying any changes it may be necessary to restart Internet Information Services on both the front-end and back-end servers. For more information, click http://www.microsoft.com/contentredirect.asp. Devon Harding Windows Systems Engineer Southern Wine & Spirits - GSD 954-602-2469 ----------------------------------------- __________________________________ This message and any attachments are solely for the intended recipient and may contain confidential or privileged information. If you are not the intended recipient, any disclosure, copying, use or distribution of the information included in the message and any attachments is prohibited. If you have received this communication in error, please notify us by reply e-mail and immediately and permanently delete this message and any attachments. Thank You.