How to encrypt logs between Fortigate/Synology and logstash

I recently implemented the ELK Stack solution to centralise logs from several devices. It works very well when I send my logs over UDP, but I'm having a few problems encrypting the logs.

Here are some of my logstash inputs :

input {    udp {        type => "log-synology"        host => "10.7.7.101"        port => 5140    }    tcp {        type => "log-synology"        host => "logs.<domaine.com>"        port => 5140        ssl_enable => true        ssl_certificate => "/etc/ssl/logstash/fullchain.pem"#       ssl_certificate_authorities => "/etc/ssl/logstash/chain.crt"        ssl_key => "/etc/ssl/logstash/privkey.pem"    }}

Here is the configuration on the Synology:Server : logs.<domaine.com>Port 5142Protocol : TCPFormat : IETF (RFC 5424)Activate secure connection (SSL) : Yes

And here is the error message :[ERROR] 2023-10-13 12:30:49.296 [nioEventLoopGroup-2-1] tcp - null: closing due:io.netty.handler.codec.DecoderException: javax.net.ssl.SSLHandshakeException: Insufficient buffer remaining for AEAD cipher fragment (2). Needs to be more than tag size (16)

I work on Ubuntu 22.04.3 LTS

Elasticsearch version 8.13.2

java --versionjava 21.0.3 2024-04-16 LTSJava(TM) SE Runtime Environment (build 21.0.3+7-LTS-152)Java HotSpot(TM) 64-Bit Server VM (build 21.0.3+7-LTS-152, mixed mode, sharing)

/usr/share/logstash/bin/logstash --versionUsing bundled JDK: /usr/share/logstash/jdklogstash 8.13.2

Hope that someone can help me.