3 PSK problems
PSK contains an odd number of hex-digits
Proxy or agent does not start, message in the proxy or agent log:
invalid PSK in file "/home/zabbix/zabbix_proxy.psk"
PSK identity string longer than 128 bytes is passed to GnuTLS
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.
PSK longer than 32 bytes is passed to mbed TLS (PolarSSL)
In any Zabbix log:
ssl_set_psk(): SSL - Bad input parameters to function