Sorry, this is the first time posting to any forum, So, am missing important data.

Below is the, part of code where am initializing and  binding connection with the server.

res = ldap_initialize(&ld, ldapuri);
if( res != LDAP_SUCCESS )
   {
     char *errorM = NULL;
      errorM = ldap_err2string(res);
      if(errorM != NULL)
       // Print Error

         return NULL;
   }
                 
if(ld != NULL)
   {
     res = ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION, &protocol );
                 
     if(res == LDAP_OPT_SUCCESS)
       {
          if(ld != NULL)
         {
           res = ldap_start_tls_s(ld, NULL, NULL);
           if(res == LDAP_SUCCESS)
            {
              if(ld !=  NULL)
               {
                  res = ldap_sasl_interactive_bind_s( ld, NULL,"NTLM", NULL, NULL,
                                                    sasl_flags, saslInteract, &auth );

                }
            }
         }
         else
          {
               //ld is null
          }
        }
     }

And below is the backtrace of the crash.

0   liblber-2.3.0.dylib                 0x007b9583 ber_sockbuf_ctrl + 147
1   libldap-2.3.0.dylib                 0x007d25ad ldap_host_connected_to + 93
2   libldap-2.3.0.dylib                 0x007c67f1 ldap_int_sasl_bind + 177
3   libldap-2.3.0.dylib                 0x007c9064 ldap_sasl_interactive_bind_s + 84
4   myApp                                      0x003f54fb 0x1000 + 4146427
5   myApp                                      0x003f7e50 0x1000 + 4157008
6   com.apple.Foundation                0x94176ff1 __NSFireMachPort + 325
7   com.apple.CoreFoundation            0x94c03402 __CFMachPortPerform + 338
8   com.apple.CoreFoundation            0x94bff16b __CFRunLoopRun + 6523
9   com.apple.CoreFoundation            0x94bfd0f4 CFRunLoopRunSpecific + 452
10  com.apple.CoreFoundation            0x94bfcf21 CFRunLoopRunInMode + 97
11  com.apple.Foundation                0x9414f380 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 279
12  com.apple.Foundation                0x9414f25d -[NSRunLoop(NSRunLoop) run] + 76
13  com.polycom.CMADesktop              0x003f4c53 0x1000 + 4144211
14  com.apple.Foundation                0x941158dc -[NSThread main] + 45
15  com.apple.Foundation                0x9411588c __NSThread__main__ + 1499
16  libSystem.B.dylib                   0x965d5a19 _pthread_start + 345
17  libSystem.B.dylib                   0x965d589e thread_start + 34