Q: Microsoft Active Directory Error: 
   javax.naming.CommunicationException: [LDAP: error code 2 - Protocol Error] 

A: By default (referral=ignore), Sun's LDAP provider (client) sends a noncritical 
   "manage referral" control (REF 3296) with each request that
   tells the LDAP server to return referral entries as ordinary entries 
   (instead of returning "referral" error responses or continuation references).
   This posts a problem for some servers that do not handle noncritical
   controls properly. To get around the problem, set java.naming.referral=follow
   before creating the initial context, this will turn-off or de-activate the manage 
   referral control.
 
   LDAP referral controls are supported only by LDAPv3 and are not transmitted
   over LDAPv2 connections. Therefore, set java.naming.ldap.version=2 shall also
   fix this error.

   See jndi reference at java.sun.com.







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