zabbix is not detecting server unrechability

[nTuple]

Hi

We want to monitor KVMs with the Zabbix6.5 server. we installed Zabbix. it was working. but it is not detecting any of the Zabbix hosts properly while they are unreachable.
Zabbix version 6.4
OS redhat 9.2
agent os ubuntu 22.04

zabbix_server (Zabbix) 6.4.6
Revision 52b7e2cb506 22 August 2023, compilation time: Aug 22 2023 00:00:00

Copyright (C) 2023 Zabbix SIA
License GPLv2+: GNU GPL version 2 or later <https://www.gnu.org/licenses/>.
This is free software: you are free to change and redistribute it according to
the license. There is NO WARRANTY, to the extent permitted by law.

This product includes software developed by the OpenSSL Project
for use in the OpenSSL Toolkit (http://www.openssl.org/).

Compiled with OpenSSL 3.0.7 1 Nov 2022
Running with OpenSSL 3.0.7 1 Nov 2022
zz0.lgzfic48kaezz

we used the Zabbix agent for all agent hosts with psk key encryption.

1872:20231228:204137.769 failed to accept an incoming connection: from 10.208.23.239: zbx_tls_accept(): gnutls_handshake() failed: -24 Decryption has failed.
  1873:20231228:204233.224 GnuTLS audit: "Discarded message[0] due to invalid decryption"
  1873:20231228:204233.224 zbx_tls_accept() gnutls_handshake() returned: -24 Decryption has failed.
  1873:20231228:204233.224 failed to accept an incoming connection: from 10.208.23.239: zbx_tls_accept(): gnutls_handshake() failed: -24 Decryption has failed.
  1874:20231228:204328.683 GnuTLS audit: "Discarded message[0] due to invalid decryption"
  1874:20231228:204328.683 zbx_tls_accept() gnutls_handshake() returned: -24 Decryption has failed.
  1874:20231228:204328.683 failed to accept an incoming connection: from 10.208.23.239: zbx_tls_accept(): gnutls_handshake() failed: -24 Decryption has failed.
  1872:20231228:204423.205 GnuTLS audit: "Discarded message[0] due to invalid decryption"
  1872:20231228:204423.205 zbx_tls_accept() gnutls_handshake() returned: -24 Decryption has failed.
  1872:20231228:204423.205 failed to accept an incoming connection: from 10.208.23.239: zbx_tls_accept(): gnutls_handshake() failed: -24 Decryption has failed.
  1873:20231228:204518.664 GnuTLS audit: "Discarded message[0] due to invalid decryption"
  1873:20231228:204518.665 zbx_tls_accept() gnutls_handshake() returned: -24 Decryption has failed.
  1873:20231228:204518.665 failed to accept an incoming connection: from 10.208..xx.xxzbx_tls_accept(): gnutls_handshake() failed: -24 Decryption has failed.
  1874:20231228:204614.132 GnuTLS audit: "Discarded message[0] due to invalid decryption"
  1874:20231228:204614.133 zbx_tls_accept() gnutls_handshake() returned: -24 Decryption has failed.
  1874:20231228:204614.133 failed to accept an incoming connection: from 10.208.xx.xx zbx_tls_accept(): gnutls_handshake() failed: -24 Decryption has failed.
  1872:20231228:204709.596 GnuTLS audit: "Discarded message[0] due to invalid decryption"
  1872:20231228:204709.596 zbx_tls_accept() gnutls_handshake() returned: -24 Decryption has failed.
  1872:20231228:204709.596 failed to accept an incoming connection: from 10.208.xx.xx: zbx_tls_accept(): gnutls_handshake() failed: -24 Decryption has failed.
  1874:20231228:204805.034 GnuTLS audit: "Discarded message[0] due to invalid decryption"
  1874:20231228:204805.034 zbx_tls_accept() gnutls_handshake() returned: -24 Decryption has failed.
  1874:20231228:204805.034 failed to accept an incoming connection: from 10.208.xx.xx zbx_tls_accept(): gnutls_handshake() failed: -24 Decryption has failed.
  1873:20231228:204900.726 GnuTLS audit: "Discarded message[0] due to invalid decryption"
  1873:20231228:204900.726 zbx_tls_accept() gnutls_handshake() returned: -24 Decryption has failed.
  1873:20231228:204900.727 failed to accept an incoming connection: from 10.208.xx.xx: zbx_tls_accept(): gnutls_handshake() failed: -24 Decryption has failed.​

Get value from agent failed: TCP successful, cannot establish TLS to [[10.208.xx.xx:10050]: SSL_connect() set result code to SSL_ERROR_SSL: file ssl/record/rec_layer_s3.c line 320 func ssl3_read_n: error:0A000126:SSL routines::unexpected eof while reading: TLS write fatal alert "decode error"

[LIST][*]Received empty response from Zabbix Agent at [10.208.xx.xx. Assuming that agent dropped connection because of access permissions.[/LIST]​

thanks
nTuple