Hi there, I'm using pre-shared key (PSK) between active proxy and server.
Randomly you can see this message on `zabbix-proxy.log`

cannot send history data to server at "zabbix...": gnutls_record_recv() failed: -110 The TLS connection was non-properly terminated.

and then you can see that internal check `zabbix[proxy,proxy-namet,lastaccess]` is rightly updated, but you cannot receive data from proxy.

I'm using OpenSSL to generate PSK

openssl rand -hex 32