Zabbix agent is not available (passive check)

[T.66]

Hello

We have a server that can't communicate with the Zabbix server.

The installation went well. The agent is running. the log do not mentionne any issue from the client side.
In the Zabbix server side we have an error saying "Zabbix agent is not available"

I'm stuck for how to get any information to step forward of this issue.

Not sure if it's a rights issue ?
Any help will be appreciate.

here is the os of the client

NAME="Ubuntu"
VERSION="18.04.5 LTS (Bionic Beaver)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 18.04.5 LTS"
VERSION_ID="18.04"
NAME="Ubuntu"
VERSION="18.04.5 LTS (Bionic Beaver)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 18.04.5 LTS"
VERSION_ID="18.04"

here is the service on the client

sudo systemctl status zabbix-agent2
● zabbix-agent2.service - Zabbix Agent 2
Loaded: loaded (/lib/systemd/system/zabbix-agent2.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2021-02-12 16:21:44 CET; 2 days ago
Process: 1802 ExecStop=/bin/kill -SIGTERM $MAINPID (code=exited, status=0/SUCCESS)
Main PID: 1803 (zabbix_agent2)
Tasks: 12 (limit: 4658)
CGroup: /system.slice/zabbix-agent2.service
└─1803 /usr/sbin/zabbix_agent2 -c /etc/zabbix/zabbix_agent2.conf

Here is the log of the client

2021/02/15 15:37:05.923869 connecting to [10.10.10.1:10051]
2021/02/15 15:37:05.924530 sending [{"request":"active checks","host":"EVOKO-01","version":"5.2"}] to [10.10.10.1:10051]
2021/02/15 15:37:05.924756 receiving data from [10.10.10.1:10051]
2021/02/15 15:37:05.925858 received [{"response":"success","data":[]}] from [10.10.10.1:10051]
2021/02/15 15:37:05.925936 [101] End of refreshActiveChecks() from [10.10.10.1:10051]
2021/02/15 15:37:05.925965 [101] processing update request (0 requests)
2021/02/15 15:37:05.925972 [101] skipping empty update for unregistered client

[T.66]

Update : i can see on the server :

Get value from agent failed: cannot connect to [[10.10.10.30]:10050]: [111] Connection refused

I checked the communication from the server side

nmap -Pn -p10050 10.10.10.30
Starting Nmap 7.70 ( https://nmap.org ) at 2021-02-16 09:35 CET
Nmap scan report for EVOKO-01 (10.10.10.30)
Host is up (0.00041s latency).

In the local system

nmap -v -sT localhost

Starting Nmap 7.60 ( https://nmap.org ) at 2021-02-16 09:56 CET
Initiating Ping Scan at 09:56
Scanning localhost (127.0.0.1) [2 ports]
Completed Ping Scan at 09:56, 0.00s elapsed (1 total hosts)
Initiating Connect Scan at 09:56
Scanning localhost (127.0.0.1) [1000 ports]
Discovered open port 3000/tcp on 127.0.0.1
Discovered open port 514/tcp on 127.0.0.1
Completed Connect Scan at 09:56, 0.02s elapsed (1000 total ports)
Nmap scan report for localhost (127.0.0.1)
Host is up (0.000095s latency).
Not shown: 998 closed ports
PORT STATE SERVICE
514/tcp open shell
3000/tcp open ppp

I can't see the zabbix ports listenning or openned.
I check firewall and it's not running.

EVOKO-01:~$ sudo ufw status
Status: inactive

[T.66]

Problem solved i have clean up my server and reinstall the agent2 from zabbix.com