[Xymon] error:14082174:SSL routines:SSL3_CHECK_CERT_AND_ALGORITHM:dh key too small

[Root, Paul T]

My keys are all 2048.

From: Dominique Frise [mailto:dominique.frise at unil.ch]
Sent: Monday, April 24, 2017 1:42 AM
To: Root, Paul T; xymon at xymon.com
Subject: RE: error:14082174:SSL routines:SSL3_CHECK_CERT_AND_ALGORITHM:dh key too small


OpenSSL was probably updated on your proxy an it reports a problem on the server you are testing (NNN.NNN.NNN.NNN). This server is using a weak DH key within the key exchange and recent versions of OpenSSL enforce a non-weak DH key because of the Logjam attack (https://weakdh.org/).



Dominique​

________________________________
De : Xymon <xymon-bounces at xymon.com<mailto:xymon-bounces at xymon.com>> de la part de Root, Paul T <Paul.Root at CenturyLink.com<mailto:Paul.Root at CenturyLink.com>>
Envoyé : vendredi 21 avril 2017 20:40
À : xymon at xymon.com<mailto:xymon at xymon.com>
Objet : [Xymon] error:14082174:SSL routines:SSL3_CHECK_CERT_AND_ALGORITHM:dh key too small

We patched our OS on our xymon proxy servers, and now we get the error in the xymonnet test

Error output:
Unspecified SSL error in SSL_connect to https (47873/tcp) on host NNN.NNN.NNN.NNN: error:14082174:SSL routines:SSL3_CHECK_CERT_AND_ALGORITHM:dh key too small


It looks like it’s some sort of issue with an openssl patch.

The machines in question are CentOS 6.9,  and xymon is 4.3.21, that we packaged ourselves.

I vaguely remember others having issues with SSL certs and xymon last year late.

Does anybody have an explanation or solution?


Thanks,
Paul.
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