Proxy or agent does not start, message in the proxy or agent log:
invalid PSK in file "/home/zabbix/zabbix_proxy.psk"
In TLS client side log:
gnutls_handshake() failed: -110 The TLS connection was non-properly terminated.
In TLS server side log.
gnutls_handshake() failed: -90 The SRP username supplied is illegal.
In any Zabbix log:
ssl_set_psk(): SSL - Bad input parameters to function
<%= selection %>