# \<OpenSSL::SSL::SSLError: Certificates do not conform to algorithm constraints\>,

**URL:** <https://discuss.elastic.co/t/openssl-certificates-do-not-conform-to-algorithm-constraints/316180>\
**Category:** Logstash\
**Tags:** docker\
**Created:** [October 10, 2022, 6:53am UTC](https://discuss.elastic.co/t/openssl-certificates-do-not-conform-to-algorithm-constraints/316180 "2022-10-10T06:53:03Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![Nikhitha\_Karennagari](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nikhitha_karennagari/32/111864_2.png) [@Nikhitha\_Karennagari](https://discuss.elastic.co/u/Nikhitha_Karennagari)\
**Post date:** [October 10, 2022, 6:53am UTC](https://discuss.elastic.co/t/openssl-certificates-do-not-conform-to-algorithm-constraints/316180/1 "2022-10-10T06:53:03Z")

</div>

Getting the below error when trying to connect to remote syslog server using ssl-tcp protocol.

```auto
SSL Error {:exception=>#<OpenSSL::SSL::SSLError: Certificates do not conform to algorithm constraints>, :backtrace=>['org/jruby/ext/openssl/SSLSocket.java:265:in `connect'', '/opt/logstash/vendor/bundle/jruby/2.5.0/gems/logstash-output-syslog-3.0.5.E001/lib/logstash/outputs/syslog.rb:223:in `connect'', '/opt/logstash/vendor/bundle/jruby/2.5.0/gems/logstash-output-syslog-3.0.5.E001/lib/logstash/outputs/syslog.rb:187:in `publish'', '/opt/logstash/vendor/bundle/jruby/2.5.0/gems/logstash-codec-plain-3.1.0/lib/logstash/codecs/plain.rb:59:in `encode'', '/opt/logstash/logstash-core/lib/logstash/codecs/delegator.rb:48:in `block in encode'', 'org/logstash/instrument/metrics/AbstractSimpleMetricExt.java:65:in `time'', 'org/logstash/instrument/metrics/AbstractNamespacedMetricExt.java:64:in `time'', '/opt/logstash/logstash-core/lib/logstash/codecs/delegator.rb:47:in `encode'', '/opt/logstash/vendor/bundle/jruby/2.5.0/gems/logstash-output-syslog-3.0.5.E001/lib/logstash/outputs/syslog.rb:147:in `receive'', '/opt/logstash/logstash-core/lib/logstash/outputs/base.rb:105:in `block in multi_receive'', 'org/jruby/RubyArray.java:1820:in `each'', '/opt/logstash/logstash-core/lib/logstash/outputs/base.rb:105:in `multi_receive'', 'org/logstash/config/ir/compiler/OutputStrategyExt.java:143:in `multi_receive'', 'org/logstash/config/ir/compiler/AbstractOutputDelegatorExt.java:121:in `multi_receive'', '/opt/logstash/logstash-core/lib/logstash/java_pipeline.rb:295:in `block in start_workers'']}

```

Any suggestions on how to solve the below error. I am using java 11.

---

<div class="post-metadata">

**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [October 10, 2022, 3:53pm UTC](https://discuss.elastic.co/t/openssl-certificates-do-not-conform-to-algorithm-constraints/316180/2 "2022-10-10T15:53:00Z")

</div>

You can examine the certificates that the syslog server is presenting by using

```
openssl s_client -showcerts -connect <server>:<port>

```

Then look for jdk.certpath.disabledAlgorithms in the java.security file that you are using. My /usr/share/logstash/jdk/conf/security/java.security has

```auto
jdk.certpath.disabledAlgorithms=MD2, MD5, SHA1 jdkCA & usage TLSServer, \
    RSA keySize < 1024, DSA keySize < 1024, EC keySize < 224

```

---

<div class="post-metadata">

**Author:** ![Nikhitha\_Karennagari](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nikhitha_karennagari/32/111864_2.png) [@Nikhitha\_Karennagari](https://discuss.elastic.co/u/Nikhitha_Karennagari)\
**Post date:** [October 11, 2022, 4:29am UTC](https://discuss.elastic.co/t/openssl-certificates-do-not-conform-to-algorithm-constraints/316180/3 "2022-10-11T04:29:13Z")

</div>

Thank you @Badger , Will get back after verifying.

---

<div class="post-metadata">

**Author:** ![Nikhitha\_Karennagari](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nikhitha_karennagari/32/111864_2.png) [@Nikhitha\_Karennagari](https://discuss.elastic.co/u/Nikhitha_Karennagari)\
**Post date:** [October 13, 2022, 6:22am UTC](https://discuss.elastic.co/t/openssl-certificates-do-not-conform-to-algorithm-constraints/316180/4 "2022-10-13T06:22:02Z")

</div>

Hi @Badger ,  
Getting the below error when trying to check the certs with openssl command.

```auto
139755014403904:error:0200206F:system library:connect:Connection refused:crypto/bio/b_sock2.c:110:
139755014403904:error:2008A067:BIO routines:BIO_connect:connect error:crypto/bio/b_sock2.c:111:
connect:errno=111

```

Also this is the content of security file

```auto
# jdk.certpath.disabledAlgorithms=MD2, DSA, RSA keySize < 2048
jdk.certpath.disabledAlgorithms=MD2, MD5, SHA1 jdkCA & usage TLSServer, \

```

---

<div class="post-metadata">

**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [October 13, 2022, 4:01pm UTC](https://discuss.elastic.co/t/openssl-certificates-do-not-conform-to-algorithm-constraints/316180/5 "2022-10-13T16:01:04Z")

</div>

> [@Nikhitha\_Karennagari](#):
>
> `Connection refused`

That would suggest that either the server is not listening or a firewall is blocking the request.

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [November 10, 2022, 4:01pm UTC](https://discuss.elastic.co/t/openssl-certificates-do-not-conform-to-algorithm-constraints/316180/6 "2022-11-10T16:01:52Z")

</div>

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