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LDAP sensor - every 2nd check is slow

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I have 3 x 2008R2 domain controllers at 2008R2 functional level. The checks in PRTG are alternating between 2200ms and 5ms. I have copied some of the output below. I updated to the latest version to see if it would make a difference.

If I use the powershell script from here it is consistent with about 5ms. https://rcmtech.wordpress.com/2014/10/07/powershell-ldap-response-time-monitor/

How can I get consistent results with PRTG?

11/01/2018 3:14:09 PM 5 msec 0 % 100 % 11/01/2018 3:13:41 PM 2,299 msec 0 % 100 % 11/01/2018 3:13:09 PM 6 msec 0 % 100 % 11/01/2018 3:12:41 PM 2,297 msec 0 % 100 % 11/01/2018 3:12:09 PM 5 msec 0 % 100 % 11/01/2018 3:11:41 PM 2,297 msec 0 % 100 % 11/01/2018 3:11:09 PM 9 msec 0 % 100 % 11/01/2018 3:10:41 PM 2,308 msec 0 % 100 % 11/01/2018 3:10:09 PM 5 msec 0 % 100 % 11/01/2018 3:09:41 PM 2,294 msec

active-directory ldap prtg15

Created on Jan 11, 2018 4:29:12 AM by  Aimee Conte (0) 1

Last change on Jan 11, 2018 2:36:17 PM by  Erhard Mikulik [Paessler Support]



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Hello Aimee,

Did you confirm this with the script running on the same host as the responsibe PRTG server/remote probe that runs the sensor? If not, please run the test again on the responsible probe system.

Kind regards,

Erhard

Created on Jan 11, 2018 2:38:11 PM by  Erhard Mikulik [Paessler Support]



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So, running the script on the same server as PRTG has the same issue of slow responses. Looks like I have some more investigation to do.

Thanks for the advice.

Created on Jan 12, 2018 1:09:21 AM by  Aimee Conte (0) 1



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Hi Aimee,

You're welcome. Maybe you can share then what you've found out.

Kind regards,

Erhard

Created on Jan 12, 2018 8:56:08 AM by  Erhard Mikulik [Paessler Support]



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LDAP tests work fine on Windows 10, 2012, 2016, 2008. The issue only occurs on 2008R2.

Also, if I use the IP address instead of FQDN or netbios name, it works fine too. DNS response times are good in PRTG, so I don't think its our DNS server.

I think there is a Group policy or security policy causing this.

Created on Jan 15, 2018 10:54:17 PM by  Aimee Conte (0) 1



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Hi Aimee,

Thank you for sharing your findings you had so far!

Kind regards,

Erhard

Created on Jan 16, 2018 9:12:54 AM by  Erhard Mikulik [Paessler Support]



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