Home/ Questions/Q 7009879
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-27T21:55:08+00:00

I’m using openssl to create self-signed certs. I’m getting this error with the certs

  • 0

I’m using openssl to create self-signed certs. I’m getting this error with the certs I generated:

javax.net.ssl.SSLHandshakeException:
java.security.cert.CertificateException: No subject alternative names
present

Does anyone know how to specify “Subject alternative name” while creating a cert?
This is how I’m generating a keystore:

sudo $JAVA_HOME/bin/keytool -genkey -dname "CN=192.168.x.xxx, OU=I, O=I, L=T, ST=On, C=CA" -alias tomcat -validity 3650 -keyalg RSA -keystore /root/.keystore -keypass abcd -storepass abcd

To generate a key:

 openssl s_client -connect 192.168.x.xxx:8443 2>/dev/null

Please help! Thanks!

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Although this question was more specifically about IP addresses in Subject Alt. Names, the commands are similar (using DNS entries for a host name and IP entries for IP addresses).

    To quote myself:

    If you’re using keytool, as of Java 7, keytool has an option to
    include a Subject Alternative Name (see the table in the documentation
    for -ext): you could use -ext san=dns:www.example.com or -ext
    san=ip:10.0.0.1

    Note that you only need Java 7’s keytool to use this command. Once you’ve prepared your keystore, it should work with previous versions of Java.

    (The rest of this answer also mentions how to do this with OpenSSL, but it doesn’t seem to be what you’re using.)

    • 0