3 PSK problems

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

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