No route to host error

[aarushi]

Hi all,
I have a server which has Zabbix installed on it, however, it keeps showing me this error:
Get value from agent failed: cannot connect to [[172.23.168.35]:10050]: [113] No route to host

The log file shows this:
3157:20170331:092007.482 Starting Zabbix Agent [Zabbix server]. Zabbix 3.0.5 (revision 62889).
3157:20170331:092007.482 **** Enabled features ****
3157:20170331:092007.482 IPv6 support: YES
3157:20170331:092007.482 TLS support: YES
3157:20170331:092007.482 **************************
3157:20170331:092007.482 using configuration file: /etc/zabbix/zabbix_agentd.conf
3157:20170331:092007.483 agent #0 started [main process]
3159:20170331:092007.484 agent #1 started [collector]
3160:20170331:092007.485 agent #2 started[listener #1]
3161:20170331:092007.487 agent #3 started[listener #2]
3162:20170331:092007.491 agent #4 started[listener #3]
3163:20170331:092007.493 agent #5 started [active checks #1]
3164:20170331:092007.495 agent #6 started [active checks #2]
3165:20170331:092007.496 agent #7 started [active checks #3]
3166:20170331:092007.497 agent #8 started [active checks #4]
3166:20170331:092007.512 active check configuration update from [153.88.37.150:10051] started to fail (cannot connect to [[153.88.37.150]:10051]: [111] Connection refused)
3163:20170331:092007.522 no active checks on server [153.88.34.161:10051]: host [Zabbix server] not found
3164:20170331:092007.523 no active checks on server [153.88.34.185:10051]: host [Zabbix server] not found
3165:20170331:092007.531 no active checks on server [153.88.37.208:10051]: host [Zabbix server] not found

Could anybody help me in identifying the reason for this?

[nobodysu]

Agent can't connect to zabbix server (172.23.168.35). Is this your server's IP? Can you ping it from client or open a port to it?
Please provide all uncommented lines from agent config.

[Ernando Silva]

Hello, I solved this problem by following the steps below:

1. I stopped the service with the command:
# systemctl stop zabbix-agent.service

2. I disabled the automatic start of the agent with the command:
# systemctl disable zabbix-agent.service

3. I uninstalled the agent with the command:
# yum remove zabbix-agent

4. I deleted the configuration file that was left in the directory:
# cd /etc/zabbix/zabbix-agent.conf

command: rm -rf zabbix_agentd.conf

5. I downloaded another more updated agent for the zabbix I am using: version 6.4 (zabbix-agent-6.4.21-release3.el8.x86_64)

6. I installed the new agent and pointed the server's IP in the . configuration:
# vim /etc/zabbix/zabbix-agent.conf

7. I saved the file and started the service with the command below:

# systemctl start zabbix-agent.service

8. I checked the status with the command:

# systemctl status zabbix-agent.service

9. I activated the service at operating system startup:

# systemctl enable zabbix-agent.service

Done!