Windows Diary

Tips To Resolve LDAP Authentication Error 0x51

Posted on by Kai Mitchell

 

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    If you get the error “LDAP Authentication 0x51 Failed”, this guide is here to help you.

     

     

    • Question

    • We have a web server with a large number of errors with source “NLASVC”, event ID “4343” and task category “LDAP authentication” with the general detail “LDAP authorization enabled” Interface crash with error 0x51â €. Our product uses CA SiteMinder to authenticate users so they can visit our website. The server has a large front NIC and a rear NIC. Can we change the concept of LDAP bindings?

      A server with connected NICs that can manage 2 networks (outer and inner, outer zone is routed) and management program (IBM IMM, DHCP) displays errors for LDAP connections:

      NLASVC Event ID 4343 “LDAP authentication job failed with error 0x51.”

      The required NIC schema is first defined for your internal network, that is, the LDAP network for connections.

      Is it possible to configure LDAP so that you cannot use networks that cannot rely on an LDAP server, or is this the fastest way to use the internal network first?

      • Undereditors Rick Solder September 11, 2013 13:49

    The Answers

    • There are no parameters to specify the order of LDAP.

      Network Location Awareness (NLA) expects you to be able to enumerate the forest domain name in order to select the correct network scheme to connect. The service does all of this by calling DsGetDcName on the primary forest name and sending an LDAP request to the udp port. 389 to the root domain controller. If one of the network adapters is available, the event is logged.

      1. To exclude the possibility of using Driver, nic, make sure they are up to date.
      2. Check all other events (event system) to find all observations
      3. Disconnect the network card and reactivate it to take effect into account. If the error is reproducible / persistent. We need to determine if this is a performance issue or a network configuration issue
      4. Maybe the problem is betweenfirewall. If the network adapter does not have a default gateway, NLA detects that the association is not identified and automatically uses a public firewall profile that has a high percentage of restrictions and security.

      . is an

      Hi Brian

      Do not forget to click Mark as Answer in the message to help you, and Unmark as Reply if the marked message no longer answers your question. This can be useful for other community members in the scan chain.

      • Marked as a response by user Amy Wang_ 18 September 2013, Wednesday 01:36

    • Question

    • We have a suitable web server with a large number. error with source “NLASVC”, identityEvent identifier “4343” and task category “LDAP authentication” and general function “LDAP authentication enabled”. Interface crash with error 0x51â €. Our system uses CA SiteMinder to authenticate users of our web content. The server has a latch for a network card on the front panel and a back for a network card. Can my husband and I change the LDAP binding order?

      A device with 2-channel network adapters connected (external and internal, external routed) and an optional management network (IBM IMM, DHCP) usually shows errors for LDAP connections:

      ldap authentication failed error 0x51

      NLASVC Event ID 4343 “LDAP Authentication Interface on Failure Error 0x51”.

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    The required order of network adapters is practically fixed for the internal network, that is, for the LDAP network in terms of connections.

    Can LDAP be configured so that it usually does not use networks that cannot connect to the server or LDAP, or at least uses most of the internal network at first?

    • Edited byshare Rick Solder September 11, 2013 13:49

    We have a high error web server with an absolute source “NLASVC”, an associated event ID “4343” and a task category “LDAP Authentication” as a generic detail of “l ‘LDAP”. authorization in ” Interface crash with error 0x51 …
    ldap authentication failed error 0x51

     

     

    Speed up your computer's performance now with this simple download.

     

     

     

     

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