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LDAP Queries Flooding Network

Occasional Contributor

LDAP Queries Flooding Network


I have several Polycom Soundpoint IP 550 phones that are making queries to IP address, port 636.  These are flooding our network and I can see the requests in my firewall logs.


Responder from country blocked: Destination IP: Country Name:Unknown, Source IP:, 4034, Destination IP:, Port: 636


  I spoke with 8x8, my provider, and they suggested calling Polycom.  I spoke with Polycom and they suggested posting to the community since the phone is out of warranty.

I loggged into the web interface for one of the phones and I can see several ldap related errors.


0725083301|ldap |4|03|ldapData::ldapConnBind:ldap_x_bind_s - rc=0xffffffff <Can't contact LDAP server>


So far no one has been able to tell me where I can check the ldap configuration on the phone, or if there is even anywhere to check it.


Can anyone assist with resolving this issue?  Let me know if any more information is needed.


Message 1 of 2
Polycom Employee & Community Manager

Re: LDAP Queries Flooding Network

Hello @Reddog ,


welcome back to the Poly Community.

Both the communities Must Read First and the FAQ reference the basic minimum information a new or follow up post should contain.

This ensures the questions having to be asked are limited and any new or follow up post contains the right amount of details to ensure any voluntary participant within the community does not spend additional time chasing basic information.

As a reminder the basic information asked for:


  • Provide the exact Software Version of your Phone
  • Provide the Phone Model
  • Provide the Call Platform (aka openSIP,Teams, Skype for Business Online, Skype for Business on Premise, Lync)
  • Provide details if UC / SIP or ObiEdition
  • Additional Poly Infrastructure (RPRM,PDMS or BToE)
  • If applicable provide a backup of the phone in question

UC Software 4.0.0 or later via the Web Interface Utilities > Phone Backup & Restore > Phone Backup > Phone Backup. Please rename into .TXT or Zip the file to attach.
Since UC Software 5.9.0 simply provide this via the Web Interface Diagnostics > Download Support Information Package

  • If possible provide a Log and either attach them or use the Code Tag.Consult the Troubleshooting Section found within the FAQ if applicable
  • If possible provide the MAC Address or Serial of the device
  • Provide details for example if the issue is a day 1 issue or only happened after an upgrade or any other relevant details
  • For questions around Support please check here


Whilst providing some of these details may not directly impact any possible answer the community can provide, it does enable Poly to have an overview of the current software used. In addition, providing all details at the same time allow us to check logs or look up potential support partners if an issue needs to come into support. It also enables us to verify the entitlement for using features.

Please ensure you always check the FAQ's and/or utilize the community search before posting any new topics or follow up posts.


Jan 30, 2012 Question: Can I use a central Phone book or is LDAP / Corporate Directory supported?

Resolution: Please check => here <=


Oct 11, 2011 Question: How can I troubleshoot configuration Issues via Log Files or the phone GUI?

Resolution: Please check => here <=


Oct 17, 2011 Question: How can change Logging Levels or use Syslog?

Resolution: Please check => here<=

Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.

Best Regards

Steffen Baier

The title Poly Employee & Community Manager is a community setting and does not reflect my role. I am just a simple volunteer in the community like everybody else. All posts and words are my own & do not represent the views of Employer.


Notice: This community forum is not an official Poly support resource, thus responses from Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge. If you need immediate and/or official assistance please open a service ticket through your proper support channels.
Please also ensure you always check the VoIP , Video Endpoint , Skype for Business , PSTN or RPM FAQ's
Message 2 of 2