Active check configuration update started to fail | timeout

[klausvonbtg]

Hey,

My Problem:
I installed the Zabbix-Agent 5.2 on my Windows-Server 2019.
Now to my problem: every time the Agent tries to connect to the server for an active-check (passive-checks are working without any problems) nothing happens. The messages in the Logfile:

“2021/02/02 16:22:52.900920 [101] active check configuration update from
[1.1.1.1:10051 Windows-Server] started to fail (Cannot read message: 'read tcp 192.168.1.5:59848->192.168.1.4:10051: i/o timeout')”

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My Configuration (the rest is on default):
##### Passive checks related
Server=192.168.1.4

##### Active checks related
ServerActive=192.168.1.4

### Option: Hostname
Hostname=Windows-Server

-----------------------------

Windows-Server IP: 192.168.1.5 | Windows-Server 2019
Zabbix-Server IP: 192.168.1.4 | Ubuntu 20.04 | Zabbix 5.2

What I have already done:
- Turn off the Firewalls on both systems (Zabbix-Server and Windows-Server)
- Tested the Connection (Ping from both are successful)
- Tested the Connectivity on TCP-Port 50051 for Zabbix-Server (Powershell-Command
Test-NetConnection)
- Look into the network environment with WireShark (No Connection from the Windows-Server
to the Zabbix-Server)

Anybody had the same issue or know the solution? I need Help. Thanks

[MuthuraG]

Did you found any help?

[Blevar]

Are you sure that 10051 port is open on the server machine? Why would you use so outdated Zabbix server/agent?