It is located in the 
$SYBASE/config directory in UNIX,
or the 
%SYBASE%/ini directory in Windows. You may need to edit 
objectid.dat only if you have changed the local name of
a security service in the 
libtcl.cfg file.
A sample entry in the 
objectid.dat file
for DCE is:
[secmech]
1.3.6.1.4.1.897.4.6.1 = dce, dcesecmech
 
 
A sample entry in the 
objectid.dat file
for Kerberos is:
[secmech]
1.3.6.1.4.1.897.4.6.6 = csfkrb5, kerberos