Why Zabbix server does not see the agent Get value error: ZBX_TCP_READ() failed: [104] Connection reset by peer?

Question

Monitoring

Good afternoon.
There is a Zabbix server and an agent on Windows Server. Pings go back and forth. The firewall is disabled on the agent. The server cannot connect to the agent, writes Get value error: ZBX_TCP_READ() failed: [104] Connection reset by peer

Answer 1

I'll answer my own question. An incorrect network mask was specified so this problem occurred.