SSL3_CHECK_CERT_AND_ALGORITHM:dh key too small

Hello

I am running Nginx version 1.10.2 on Centos 6.9 for a long time. Nginx serves as a reverse proxy to Glassfish 3 running some application.

Today when I rebooted my machine and I opened the URL to Nginx I got Bad Gateway. The error logs show following:

2017/10/01 05:28:48 [crit] 11408#0: *5 SSL_do_handshake() failed (SSL: error:14082174:SSL routines:SSL3_CHECK_CERT_AND_ALGORITHM:dh key too small) while SSL handshaking to upstream, client: 123.456.789.123, server: mydomain.net, request: "GET /apex/f?p=123 HTTP/1.1", upstream: "https://127.0.0.1:9191/apex/f?p=123", host: "www.mydomain.net", referrer: "http://www.mydomain.net/"

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I am able to access Glassfish with https://Hostname:9191/apex ... without a problem.

I am not sure what to do to fix this issue.

OpenSSL version is following:

-bash-4.1# rpm -qa openssl*
openssl098e-0.9.8e-20.el6.centos.1.x86_64
openssl-devel-1.0.1e-57.el6.x86_64
openssl-1.0.1e-57.el6.x86_64

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I will be really thankful if someone can help.