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Re: need help interpreting "Error: ldap_back_is_proxy_authz returned 0, misconfigured URI?"

Steve Eckmann wrote:

The answer would be obvious if we had a misconfigured URI, but I don't think we do. In fact, we are getting this error from the ldap/translucent proxy on a first attempt to retrieve a DN from a remote Active Directory, then a second identical ldapsearch always succeeds. That makes us think there might be a timing issue getting from our openldap server, through a forwarding proxy out of a DMZ, and finally to the target AD server. But since all the openldap log messages appear with the same timestamp, there would have to be a sub-second timeout somewhere in the path. Does openldap have any default sub-second timeouts? I haven't configured any of the slapd or slapd-ldap timeout options.
You can find the relevant code in back-ldap/bind.c. It means it was trying to do proxy authorization on the connection but doesn't have the required credentials or some other config item so it couldn't authorize to the remote server. So go check your back-ldap configuration again. 

Here is a typical log from a failed search:

   Jul 15 09:46:09 eck1 slapd[9198]: conn=1001 fd=10 ACCEPT from IP=172.20.11.85:54864 (IP=0.0.0.0:636)
   Jul 15 09:46:09 eck1 slapd[9198]: conn=1001 fd=10 TLS established tls_ssf=256 ssf=256
   Jul 15 09:46:09 eck1 slapd[9198]: conn=1001 op=0 BIND dn="cn=localuser,ou=users,ou=Native,dc=example,dc=com" method=128
   Jul 15 09:46:09 eck1 slapd[9198]: conn=1001 op=0 BIND dn="cn=localuser,ou=users,ou=Native,dc=example,dc=com" mech=SIMPLE ssf=0
   Jul 15 09:46:09 eck1 slapd[9198]: conn=1001 op=0 RESULT tag=97 err=0 text=
   Jul 15 09:46:09 eck1 slapd[9198]: conn=1001 op=1 SRCH base="dc=example,dc=com" scope=2 deref=0 filter="(sAMAccountName=steve.eckmann)"
   Jul 15 09:46:09 eck1 slapd[9198]: conn=1001 op=1 SRCH attr=cn
   Jul 15 09:46:09 eck1 slapd[9198]: conn=1001 op=1 ldap_back_retry: retrying URI="ldap://172.30.11.20"; DN="cn=remoteuser,ou=users,ou=system accounts,dc=example,dc=com"
   Jul 15 09:46:09 eck1 slapd[9198]: Error: ldap_back_is_proxy_authz returned 0, misconfigured URI?
   Jul 15 09:46:09 eck1 slapd[9198]: <= mdb_equality_candidates: (sAMAccountName) not indexed
   Jul 15 09:46:09 eck1 slapd[9198]: conn=1001 op=1 SEARCH RESULT tag=101 err=0 nentries=0 text=
   Jul 15 09:46:09 eck1 slapd[9198]: conn=1001 op=2 UNBIND
   Jul 15 09:46:09 eck1 slapd[9198]: conn=1001 fd=10 closed

Thanks.

Steve






--
  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/