Hello again.
Using the TLS, things aren’t all clear for me. Does Graylog cannot work with self-signed certificates? Or what trick should I do?
If I use a self–signed certificate Graylog would say something like
pkix path validation failed … signature check failed
I understand tha is due to the lack of CA, but I kind of newbie about certificates. 
Greetings
Check doc, how to setup self-sign cert to truststore:
https://docs.graylog.org/en/3.2/pages/configuration/https.html#creating-a-self-signed-private-key-certificate
https://docs.graylog.org/en/3.2/pages/configuration/https.html#adding-a-self-signed-certificate-to-the-jvm-trust-store
Well, I found my error, adding the CA to the key store,Where is the CA? I followed the docs, only have the files cacerts.jks, cert.pem and pkcs8-plain.pem.
@Luisj5231
I dont know if this will help you but i found my solution here:
In fact, found my error, it seems that I created the certs as root user, did it again as non root user and all Ok, thanks! 
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