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Question by Akshay S. · Jul 10, 2019 at 01:57 PM · extensions monitoring

Does Dynatrace monitor SSL certificate validation

Hi Folks,

We have a customer who wants to monitor SSL certification validation check via dynatrace.

Is it possible to monitor SSL certificate validation? I'm seeking more information from the customer about the this but this is what I got as requirement.

BR,

AK

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avatar image Darshana R. · Aug 11, 2020 at 03:09 PM 0
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Hi Julius,

I have uploaded the plugin via dynatrace UI and unzipped the file the /opt/dynatrace/oneagent/plugin_deployment.

But I am not able to see any data .

Note : Since plugin_deplyment directory was not available by default I created this directory then proceeded with further steps.

Also i m not able to see log file for plugin in /opt/dynatrace/oneagent/log


I have tried using both 1.0 and 1.01 version but no success

Am i missing anything ?

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avatar image Sandeep K. · Nov 09, 2020 at 02:23 AM 0
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Pls see if this Synthetic monitoring option works for you.

https://www.dynatrace.com/support/help/shortlink/http-monitor#create-an-http-monitor

1604888573010.png (8.1 KiB)
avatar image Kalle L. Sandeep K. · Nov 09, 2020 at 03:42 PM 0
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Hi,

Does anyone know whether that would work for browser/clickpath monitors? At least based on my quick testing, an invalid cert didn't show the clickpath as unavailable. It's strange in a way that browser monitors are the more advanced ones (and expensive regarding DEM consumption) but appear to be missing the certificate check feature?

avatar image Reinhard W. · Nov 12, 2020 at 09:07 PM 2
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Plugin-less SSL Check for public sites with Dynatrace Synthetic!

I've been digging a bit more for a solution that does not require any custom agent or active gate plugins and would reuse what is already existing with the standard synthetic monitors.

I found a feasible workaround solution that at least works for public sites, which might be handy for people:

It works like this:

  • Use a basic HTTP synthetic monitor
  • in combination with a public SSL-Check site that provides an API: https://ssltools.godaddy.com/views/certChecker
  • Create a HTTP Post request in the monitor that POSTs to that API with the URL that you want to check.
  • Use a Post-Execution script to validate the response/evaluate the expiry information and eventually fail the synthetic monitor via it's api calls (see here)


I'm attaching the Synthetic monitor definition so you can post that via the config-api to create such a monitor: synthettic-monitor-http-ssl-check.json.zip
(API first - better than screenshots!)

Hope that helps all the folks out there who want to verify their certificates in Dynatrace!

synthettic-monitor-http-ssl-checkjson.zip (1.6 KiB)

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Best Answer

Answer by Július L. · Jan 12, 2020 at 09:38 PM

I've written a OneAgent plugin for SSL/TLS certificate expiration check (also does notification in advance). If you need to check certificates locally for any process running on a host monitored by oneagent.

If you are interested, you can download it from https://github.com/juliusloman/dynatrace-oneagent-plugin-sslcertcheck.

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avatar image Gokul S. · Jan 13, 2020 at 10:03 AM 1
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Hi Julius,


I have uploaded your OneAgent plugin for SSL/TLS certificate expiration however dont how to deploy plugin to hosts running OneAgents

avatar image Július L. Gokul S. · Jan 13, 2020 at 10:28 AM 1
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Download the zip file. (available in the releases tab).

You have to do two steps:

  1. Upload the plugin into the tenant in Settings > Monitoring > Monitored technologies
  2. Unzip the plugin on each oneagent monitored host in /opt/dynatrace/oneagent/plugin_deployment/ (if you oneagent is installed in the default path).
    Dynatrace does not have any means to deploy the plugin centrally, that why you have to deploy it manually or using some configuration management tools.

OneAgent will pick up the new plugin just after a few minutes. No need to restart OneAgent

avatar image Gokul S. · Jan 14, 2020 at 11:10 AM 1
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i have given it necessary permission as well

*ADMINSHELL* opt/dynatrace/remotepluginmodule/plugin_deployment/dynatrace-oneagent-plugin-sslcertcheck-master # ll
total 20
-rwxr-xr-x 1 root root 2277 Jan 12 21:22 plugin.json
-rwxr-xr-x 1 root root 2172 Jan 12 21:22 README.md
-rwxr-xr-x 1 root root 9410 Jan 12 21:22 sslcertcheck_plugin.py
*ADMINSHELL* opt/dynatrace/remotepluginmodule/plugin_deployment/dynatrace-oneagent-plugin-sslcertcheck-master #

avatar image Július L. Gokul S. · Jan 14, 2020 at 11:23 AM 1
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First - you have downloaded the repo, not the built plugin. Head to the releases page and download the release zip file, that's actually here.

Second - you have put it into the directory of ActiveGate plugin module. This is a OneAgent plugin, not an ActiveGate plugin. Unless you have installed OneAgent in some nondefault directory, it is the /opt/dynatrace/oneagent/plugin_deployment/ directory.

avatar image Gokul S. Július L. · Jan 14, 2020 at 12:09 PM 1
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Yes,I have downloaded file name called Source code(ZIP) and I have uploaded like below.


Is it right way to download and upload it?

capture.jpg (71.7 KiB)
avatar image Július L. Gokul S. · Jan 14, 2020 at 12:31 PM 1
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No, it is the file custom.python.sslcertcheck_plugin.zip not the zip code.
Upload this file to the tenant as on your screenshot and also unzip the file on an agent.

avatar image Gokul S. Július L. · Jan 14, 2020 at 01:02 PM 1
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unzip the file on an agent means do i have to unzip and put this custom.python.sslcertcheck_pluginunder /opt/dynatrace/oneagent/plugin_deployment/ on the host right?

avatar image Július L. Gokul S. · Jan 14, 2020 at 01:17 PM 1
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Exactly. Is should look like this


# ls -l /opt/dynatrace/oneagent/plugin_deployment/custom.python.sslcertcheck_plugin/  
total 
drwxrwxr-x 1 root root  382 Jan 12 22:24 asn1cryp
drwxrwxr-x 1 root root   96 Jan 12 22:24 asn1crypto-1.3.0.dist-in
-rwxrwxr-x 1 root root 2277 Jan 12 22:21 plugin.js
-rwxrwxr-x 1 root root 2172 Jan 12 22:17 README.
drwxrwxr-x 1 root root   82 Jan 12 22:24 sslcertcheck_plugin-1.0.dist-in
-rwxrwxr-x 1 root root 9410 Jan 12 22:02 sslcertcheck_plugin.py
avatar image Gokul S. Július L. · Jan 21, 2020 at 10:43 AM 0
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As per your guideline,I have uploaded,still its not capturing

how to check the certificate are listed and monitoring in dynatrace?

*ADMINSHELL* opt/dynatrace/remotepluginmodule/plugin_deployment/custom.python.sslcertcheck_plugin # ll
total 32
drwxr-xr-x 2 root root 4096 Jan 21 09:18 asn1crypto
drwxr-xr-x 2 root root 4096 Jan 21 09:18 asn1crypto-1.3.0.dist-info
-rwxr-xr-x 1 root root 2277 Jan 21 09:18 plugin.json
-rwxr-xr-x 1 root root 2172 Jan 21 09:18 README.md
drwxr-xr-x 2 root root 4096 Jan 21 09:18 sslcertcheck_plugin-1.0.dist-info
-rwxr-xr-x 1 root root 9410 Jan 21 09:18 sslcertcheck_plugin.py


1579603376493.png (68.1 KiB)
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avatar image Július L. Gokul S. · Jan 21, 2020 at 12:43 PM 0
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Hello @Gokul S.,
you still have the plugin copied in an incorrect directory. This directory is for the remote plugins (executed by ActiveGate).

You need to have the plugin copied in this directory

/opt/dynatrace/oneagent/plugin_deployment/custom.python.sslcertcheck_plugin/

and not in:

/opt/dynatrace/remotepluginmodule/plugin_deployment/custom.python.sslcertcheck_plugin


I've added a new release (1.01) that of the plugin that will inform you about certificates the plugin found and will monitor:

1579610604849.png (50.9 KiB)
avatar image Gokul S. Július L. · Jan 24, 2020 at 08:47 AM 0
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Still its not working.

Can you review my below steps :

1)I have place the custom.python.sslcertcheck_plugin zip file under Settings->Monitoring->Monitored technologies->Add new technology monitoring->Build OneAgent plugin with Python->Upload your plugin here or via command line (choose Upload plugin)

2)Unzip the custom.python.sslcertcheck_plugin file and placed the file under

opt/dynatrace/oneagent/plugin_deployment/custom.python.sslcertcheck_plugin/custom.python.sslcertcheck_plugin# ll
total 32
drwxr-xr-x 2 root root 4096 Jan 23 13:11 asn1crypto
drwxr-xr-x 2 root root 4096 Jan 23 13:11 asn1crypto-1.3.0.dist-info
-rwxr-xr-x 1 root root 2278 Jan 23 13:11 plugin.json
-rwxr-xr-x 1 root root 3017 Jan 23 13:11 README.md
drwxr-xr-x 2 root root 4096 Jan 23 13:11 sslcertcheck_plugin-1.1.dist-info
-rwxr-xr-x 1 root root 10459 Jan 23 13:11 sslcertcheck_plugin.py

Is it right?

avatar image Július L. Gokul S. · Jan 26, 2020 at 08:27 PM 0
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You have it unzipped in one more directory - you have two directories custom.python.sslcertcheck_plugin in the path.

It must look like this:

# ls -al /opt/dynatrace/oneagent/plugin_deployment/custom.python.sslcertcheck_plugin/
total 20
drwxrwxr-x 1 root root  222 Jan 16 15:41 .
drwxr-xr-x 1 root root  140 Jan 13 11:25 ..
drwxrwxr-x 1 root root  382 Jan 12 22:24 asn1crypto
drwxrwxr-x 1 root root   96 Jan 12 22:24 asn1crypto-1.3.0.dist-info
-rwxrwxr-x 1 root root 2277 Jan 12 22:21 plugin.json
-rwxrwxr-x 1 root root 2172 Jan 12 22:17 README.md
drwxrwxr-x 1 root root   82 Jan 12 22:24 sslcertcheck_plugin-1.0.dist-info
-rwxrwxr-x 1 root root 9458 Jan 16 15:41 sslcertcheck_plugin.
avatar image Gokul S. · Jan 14, 2020 at 11:11 AM 1
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still its not capturing ,How much time take to pick it up?

avatar image Dallas P. · Jan 27, 2020 at 07:08 PM 3
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Hey Julius,

This is awesome. I have been asked about this type of feature before. Appreciate you for open sourcing this project!

Thanks

-Dallas

avatar image Július L. Dallas P. · Jan 27, 2020 at 09:28 PM 2
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Thanks! Happy to share.

avatar image Praveen Július L. · Feb 20, 2020 at 12:28 PM 1
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Thanks for clear explanation usage of the plugin. @Julius L.

avatar image Antonio S. · May 12, 2020 at 09:31 AM 1
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Pretty cool stuff! Do you know if there is a compilation of other types of plugins?

avatar image Sandeep K. · May 20, 2020 at 05:25 AM 1
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Hi Julius, thanks for writing this plugin. We're looking for something like this. I have exactly done as per the given steps for my Apache HTTP Server running on Windows 2012, but its not capturing the data. Please help.

Regards, Sandeep

avatar image Hashim J. · Jul 22, 2020 at 09:27 AM 1
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Hi Julius, thanks for this wonderful plugin, it is successfully detecting the certificates.


One quick query regarding the metrics consumption, will it consume any custom metrics in terms of licenses?


Thanks.

avatar image Július L. Hashim J. · Jul 24, 2020 at 09:48 AM 1
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No custom metrics are consumed.

avatar image Suryakant S. · Jul 24, 2020 at 09:10 AM 0
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Hi Julius,

Followed the same procedure. But receiving an error. Is this known ?

How to clear this ?

1595581910448.png (7.9 KiB)
avatar image Július L. Suryakant S. · Jul 24, 2020 at 09:49 AM 0
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Can you share the plugin engine log file from that agent?

avatar image Suryakant S. Július L. · Jul 24, 2020 at 11:15 AM 0
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Error is being triggered because of line 148 in the python file.

sub=cert['subject'].native['common_name'],

Py code near the line 148 :

self.logger.info("SSLCheck result {hps} subject CN {sub} notvalidbefore {nvb} novalidafter {nva}".format(hps=hps,
sub=cert['subject'].native['common_name'],
nvb=cert['validity']['not_before'].native,
nva=cert['validity']['not_after'].native))


In the plugin engine log :

2020-07-24 13:36:14,326 DEBUG 140009279579904(MainThread) - [report_status] {('custom.python.sslcertcheck_plugin', 9331643405291913339): (PluginFullStatus(pluginName=custom.python.sslcertcheck_plugin, pluginVersion=1.01, state=ERROR_UNKNOWN, description=common_name, monitoredEntityId=xxxxxxxxxx, stacktrace=Traceback (most recent call last):
File "/var/lib/dynatrace/oneagent/agent/runtime/engine_unpacked/ruxit/plugin_state_machine.py", line 340, in _execute_next_task
self._query_plugin()
File "/var/lib/dynatrace/oneagent/agent/runtime/engine_unpacked/ruxit/plugin_state_machine.py", line 672, in _query_plugin
self._plugin_run_data.plugin_instance._query_internal(**self._plugin_run_data.plugin_args)
File "/var/lib/dynatrace/oneagent/agent/runtime/engine_unpacked/ruxit/api/base_plugin.py", line 455, in _query_internal
return self.query(**kwargs)
File "/opt/dynatrace/oneagent/plugin_deployment/custom.python.sslcertcheck_plugin/sslcertcheck_plugin.py", line 148, in query
sub=cert['subject'].native['common_name'],
KeyError: 'common_name'
),


Hope this would be sufficient.

avatar image Suryakant S. Suryakant S. · Jul 24, 2020 at 12:14 PM 0
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Hi Julius,

The plugin is working for other servers.
Seems like there is some issue for that particular server.
Could you point out what that can be ?


Appreciate your quick responses and superb plugin development !

avatar image Avinash P. · Jul 28, 2020 at 07:56 PM 0
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Hi @Julius L.
when you get a chance, can you please respond to my post on the issue i am having..
Thanks,
Avi

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Best Answer

Answer by Leon Z. · Mar 12, 2020 at 03:03 PM

We have created an AG Plugin that checks Certs: https://github.com/mediro-ict/activegate_python_ssl_plugin

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avatar image Sandeep K. · May 20, 2020 at 10:32 AM 2
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It worked for me. Thanks!

avatar image Siddhi P. · Aug 20, 2020 at 01:27 PM 0
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@Leon Van Z.Thank you for the plugin.I have successfully uploaded activegate plugin in dynatrace but not able to capture the details...It has getting error: Hosts not being polled..Also I have query about host details format..The format is like www.example.com:443 but I have entered hostname like example:443 which is the name assign to particular host...could you please help me to resolve this issue.


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Answer by Alexandre M. · Aug 04, 2020 at 05:08 PM

It would be so nice to have it out of the box ! It is part of basic monitoring of the system and should be included if OneAgent is installed on the server and detect any https endpoint.

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Answer by Larry R. · May 11, 2020 at 06:20 PM

@Julius L. At long last I got around to trying this out and I must say.... OUTSTANDING!

This is a keeper! Thank you!

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avatar image Július L. · May 11, 2020 at 08:34 PM 1
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Thanks @Larry R.!... I have made few fixes - mainly regarding metadata - all information in one entry for each certificate. I hope this will be in the repository very soon.

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Answer by Reinhard W. · Nov 10, 2020 at 08:47 AM

I see different approaches for testing the validity of a certificate and great that there are now multiple plugins to do so, with different advantages:

OneAgent Plugin
  • only possible to check local plugins by default.
  • Certificate (SSL connect) must be on the local server where the oneagent runs
  • would not work if the certificate/ssl is e.g. hosted/terminated externally (e.g. a F5 without an agent installed)
  • could potentially check the certificate file directly instead of doing an SSL connect
ActiveGate Plugin
  • can connect to any ssl endpoint (just like a synthetic monitor)
  • obviously needs an Active Gate for plugin execution
Standard synthetic monitors
  • doesn't exist yet
  • would be integrated where it's naturally expected - with synthetic tests
  • only "valid" checks exist so far
  • an additional expiry in x days would be useful and shouldn't be too hard to build, but would add additional verification steps on every execution
  • an extra synthetic monitor that runs every 24hrs only once could be an option also - low frequency would be enough and not too costly
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avatar image Július L. · Nov 10, 2020 at 09:40 AM 0
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Just to add for the OneAgent plugin - I considered checking the files or keystores (I did similar plugin for a different monitoring tool a while ago) it has severe limitations:

  • Extensions run as non-privileged user. It's very likely extension won't have access to certificate or keystore files from the extension itself.
  • I tried to implement certfile checks in in the SSL OneAgent extension anyway, but all useful python modules required native libraries conflicting with the extension engine libraries. I simply could not get this working. Maybe I did not try hard enough.
  • A remote check can be done from OneAgent, but you cannot send events to entities outside the OneAgent monitored host or process.
avatar image Antonio S. · Nov 10, 2020 at 08:17 PM 0
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Nice summary!

I would add that some HTTPS sites are not globally accessible. That might mean that Activegate and/or synthetic monitors might not reach them.

I can imagine that OneAgent plugins can also check remote servers, like Július refers to, but there might be limitations there.

There's also always the API route...

Will also be interesting to know if some type of information regarding TLS security will be available in the incoming Dynatrace security functionality...

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Answer by Yeshokiran N. · 4 days ago

@Július L. Thank you for sharing the plugin. I've used 1.02 version of plugin.

I followed two steps

1. to add/upload extension -successful

2. to copy/extract the plugin to the following location

[SERVER custom.python.sslcertcheck_plugin]$ pwd

/opt/dynatrace/oneagent/plugin_deployment/custom.python.sslcertcheck_plugin

[SERVER custom.python.sslcertcheck_plugin]$ ll

total 40

drwxrwxr-x 2 root root 4096 Dec 18 17:09 asn1crypto

drwxrwxr-x 2 root root 4096 Dec 18 17:09 asn1crypto-1.4.0.dist-info

-rwxrwxr-x 1 root root 2473 Nov 12 08:56 plugin.json

drwxrwxr-x 3 root root 4096 Dec 18 17:09 pytz

drwxrwxr-x 2 root root 4096 Dec 18 17:09 pytz-2020.4.dist-info

-rw-rw-r-- 1 root root 3336 Nov 12 09:54 README.md

drwxrwxr-x 2 root root 4096 Dec 18 17:09 sslcertcheck_plugin-1.2.dist-info

-rw-rw-r-- 1 root root 11272 Dec 18 17:09 sslcertcheck_plugin.py


Then I've changed the Global Configuration and it showed me the hosts are being correctly monitored initially then shows the following error, I guess its the error due to certificate expiry date falling in the notification/error range but I couldn't get any notification and details. I couldn't find the plugin log file to get any further details. Could you suggest please?



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avatar image Július L. · 4 days ago 0
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Can you please share the log file and open a github issue?

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Answer by Reinhard W. · Nov 12, 2020 at 09:08 PM

Plugin-less SSL Check for public sites with Dynatrace Synthetic!

I've been digging a bit more for a solution that does not require any custom agent or active gate plugins and would reuse what is already existing with the standard synthetic monitors.

I found a feasible workaround solution that at least works for public sites, which might be handy for people:

It works like this:

  • Use a basic HTTP synthetic monitor
  • in combination with a public SSL-Check site that provides an API: https://ssltools.godaddy.com/views/certChecker
  • Create a HTTP Post request in the monitor that POSTs to that API with the URL that you want to check.
  • Use a Post-Execution script to validate the response/evaluate the expiry information and eventually fail the synthetic monitor via it's api calls (see here)


I'm attaching the Synthetic monitor definition so you can post that via the config-api to create such a monitor: synthettic-monitor-http-ssl-check.json.zip
(API first - better than screenshots!)

Hope that helps all the folks out there who want to verify their certificates in Dynatrace!

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Answer by Simran A. · Aug 04, 2020 at 10:23 AM

Hi @Julius L. I have deployed this but getting same events continously ,like it is giving details of same certificate again and again ,so can you tell like what is to be changed so that we do not get same certificate after every one min or so


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Answer by Avinash P. · Jul 21, 2020 at 07:54 PM

Hi @Julius Loman
we installed the plugin on the server and uploaded extension in dynatrace. but we are getting an error

Error ('SSLCertCheck_Plugin' object has no attribute 'config') for:

lnbroams04.highmark.com


please help us on what we are missing here..

on server

/opt/dynatrace/oneagent/plugin_deployment/custom.python.sslcertcheck_plugin

drwxrwxr-x. 2 root root 4096 Jan 21 13:19 asn1crypto

drwxrwxr-x. 2 root root 4096 Jan 21 13:19 asn1crypto-1.3.0.dist-info

-rwxrwxr-x. 1 root root 2278 Jan 21 09:46 plugin.json

-rwxrwxr-x. 1 root root 3017 Jan 21 10:54 README.md

drwxrwxr-x. 2 root root 4096 Jan 21 13:19 sslcertcheck_plugin-1.1.dist-info

-rwxrwxr-x. 1 root root 10459 Jan 21 13:19 sslcertcheck_plugin.py



in Dynatrace



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avatar image Dylan M. · Jul 21, 2020 at 07:57 PM 0
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Plugin logs for reference:

ruxitagent_pluginagent_84594.0.log

ruxitagent-pluginagent-845940.log (118.0 KiB)
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Answer by Nitin K. · Jul 20, 2020 at 02:40 PM

@Sandeep K. i also successfully connected but in dynatrace which tab i can see my certification details?

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avatar image Július L. · Jul 21, 2020 at 07:19 AM 1
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If you used my plugin it will show in the properties for the process group (you need to expand them).

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