For the network security environment to work properly, both servers and clients should be started only after they have a valid credential.
For Kerberos systems:
On UNIX systems, servers and clients should be started after a kinit
On Windows NT systems, server and clients can be started automatically using the single sign-on feature or manually using the Kerberos credentials manager.
Refer to your Kerberos documentation for more information.
Transarc DCE systems behave in similar manner, refer to your Transarc documentation for information about setting up the proper environment.