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Short definitions of LDAP error Codes as defined in the error logs (which uses decimal error no.), or returned by the server.

Message:                        Hex:    Dec:

LDAP CONNECTION SUCCESSFUL      0x00    0
LDAP OPERATIONS ERROR           0x01    1
LDAP PROTOCOL ERROR             0x02    2
LDAP TIMELIMIT EXCEEDED         0x03    3    
LDAP SIZELIMIT EXCEEDED         0x04    4
LDAP COMPARE FALSE              0x05    5
LDAP COMPARE TRUE               0x06    6
LDAP STRONG AUTH NOT SUPPORTED  0x07    7
LDAP STRONG AUTH REQUIRED       0x08    8 
LDAP PARTIAL RESULTS            0x09    9
LDAP REFERRAL RECEIVED          0x0a    10 
LDAP ADMINLIMIT EXCEEDED        0x0b    11 
 
LDAP NO SUCH ATTRIBUTE          0x10   16
LDAP UNDEFINED TYPE             0x11   17
LDAP INAPPROPRIATE MATCHING     0x12   18
LDAP CONSTRAINT VIOLATION       0x13   19
LDAP TYPE OR VALUE EXISTS       0x14   20
LDAP INVALID SYNTAX             0x15   21
 
LDAP NO SUCH OBJECT             0x20   32
LDAP ALIAS PROBLEM              0x21   33
LDAP INVALID DN SYNTAX          0x22   34 
LDAP IS LEAF                    0x23   35
LDAP ALIAS DEREF PROBLEM        0x24   36
 
NAME ERROR(n)   ((n & 0xf0) == 0x20)   37

LDAP INAPPROPRIATE AUTH         0x30   48
LDAP INVALID CREDENTIALS        0x31   49
LDAP INSUFFICIENT ACCESS        0x32   50
LDAP BUSY                       0x33   51
LDAP UNAVAILABLE                0x34   52
LDAP UNWILLING TO PERFORM       0x35   53
LDAP LOOP DETECT                0x36   54

LDAP NAMING VIOLATION           0x40   64
LDAP OBJECT CLASS VIOLATION     0x41   65
LDAP NOT ALLOWED ON NONLEAF     0x42   66
LDAP NOT ALLOWED ON RDN         0x43   67
LDAP ALREADY EXISTS             0x44   68
LDAP NO OBJECT CLASS MODS       0x45   69
LDAP RESULTS TOO LARGE          0x46   70

LDAP OTHER                      0x50   80
LDAP SERVER DOWN                0x51   81
LDAP LOCAL ERROR                0x52   82
LDAP ENCODING ERROR             0x53   83
LDAP DECODING ERROR             0x54   84
LDAP TIMEOUT                    0x55   85

LDAP AUTH UNKNOWN               0x56   86
LDAP FILTER ERROR               0x57   87
LDAP USER CANCELLED             0x58   88 
LDAP PARAM ERROR                0x59   89
LDAP NO MEMORY                  0x5a   90
LDAP CONNECT ERROR              0x5b   91

Here are some common error codes and some possible solutions or  things to check for:

Message	Hex	Dec	Possible Cause	Solution
Connection Succesful	0x00	0	· The operation was successful  · The BIND or connection was succesful	N/A
Partial Results & Referral Received	0x09	9	· The Search BASE DN specified on the client is incorrectly specified.  · The Search BASE DN as specified does not exist or has not been set on the   directory server.  · A referral was received from the server.	· Make sure that the client doing the request has the proper BASE DN specified.  · Make sure that the proper suffix has been configured for your database. (example Base/suffix: o=Ace industry,c=US).  · The client received a referral (for another server) which could not be followed.
No such Attribute	0x10	16	· The attribute specified is not defined in the server’s schema	· Make sure that the correct attribute is specified (no typos).  ·If the attribute is correct, make sure to add it to the server’s slapd.at.conf file.
No such Object	0x20	32	· The entry or attribute requested does not exist on the directory server.	· Make sure the Directory Server has the data you expected it to have. Import Database etc.
Invalid Credentials	0x31	49	· The password given is incorrect for the entry one is BINDing as.	· Enter the correct password. · Give the entry a new password, and reconnect with the correct password.
Insufficient Access	0x32	50	· You are denied to perform the operation requested (Add, Delete, Modify etc).	· Give the user the proper privileges. · Check the ACL rules to make sure they are correct.
Unwilling To Perform	0x35	53	· The database is in READ-ONLY mode. · The database connect perform operation due to other problems	· Make sure the database is NOT in read-only mode. · Check to see if there are any errors on the Directory Servers.
Object Class Violation	0x41	65	· The objectclass being created is unknown to the directory server. · An attribute in the new objectclass is unrecognized by the directory server.	· update the slapd.oc.conf/slapd.at.conf to recognize the new objectclass/attributes (see manual). · Make sure that you are running the latest Directory Server.
Already Exists	0x44	68	· The entry/value you are creating, already exists in the directory server.	· No need to update the directory server, since it already has this value/entry.
Server Down	0x51	81	· The directory server is down. · The client cannot reach the directory server. · The directory server is not responding.	· Start the directory server. · Make sure that the client can connect to the directory server. · The directory server is not working properly, and needs to be diagnosed. (On NETRA see technote 970923-1).