If the krb5.conf file is not formatted properly, the telnet command will fail. However, the dtlogin and login commands will still succeed, even if the krb5.conf file is specified as required for the commands. If this problem occurs, the following error message is displayed:
Error initializing krb5: Improper format of Kerberos configuration
In addition, an incorrectly formatted krb5.conf file, prevents the applications that use the GSSAPI from using the krb5 mechanisms.
If there is a problem with the format of the krb5.conf file, you are vulnerable to security breaches. You should fix the problem before you allow Kerberos features to be used.