What does this Directory Error Mean?

Can anyone give an idea about this error? This maybe the problem as to why my students' log in is so slow!

-- Start: Server rolled log on: Apr 23 2013 10:42:36 --

2013-04-23 10:44:08 EDT - T[0x0000000102604000] - Misconfiguration detected in hash 'Global SID':

2013-04-23 10:44:08 EDT - T[0x0000000102604000] - Computer 'guest' (/LDAPv3/127.0.0.1) - ID -1 - UUID 6D0E65A9-064A-480C-8CE3-983775875271 - SID S-1-5-21-2153404155-2663940200-298794677-998

2013-04-23 10:44:08 EDT - T[0x0000000102604000] - Computer 'osxsrvrm312.18b115.nycboe.org$' (/Local/Default) - ID -1 - UUID 892E1B9E-1332-4FBB-823C-594C33FD0257 - SID S-1-5-21-2153404155-2663940200-298794677-998

2013-04-23 10:44:08 EDT - T[0x0000000100381000] - Misconfiguration detected in hash 'Global SID':

2013-04-23 10:44:08 EDT - T[0x0000000100381000] - Computer 'guest' (/LDAPv3/127.0.0.1) - ID -1 - UUID 6D0E65A9-064A-480C-8CE3-983775875271 - SID S-1-5-21-2153404155-2663940200-298794677-998

2013-04-23 10:44:08 EDT - T[0x0000000100381000] - Computer 'osxsrvrm312.18b115.nycboe.org$' (/Local/Default) - ID -1 - UUID 892E1B9E-1332-4FBB-823C-594C33FD0257 - SID S-1-5-21-2153404155-2663940200-298794677-998