cannot process incoming connection: read tcp timeout

[tbala]

Hello,

I am having some issues while setting up a passive Zabbix agent.
I use on a remote site a Zabbix Dockerized proxy (zabbix/zabbix-proxy-mysql:centos-6.0-latest) with Docker Desktop on Windows server,

I installed a Zabbix agent version 2 (6.0.4) on a Linux server in passive mode, every 2 min I have a message in the "/var/log/zabbix/zabbix_agent2.log" file:

cannot process incoming connection: read tcp [IP-Agent2]:10050->[IP-Proxy]:50215: i/o timeout
cannot process incoming connection: read tcp [IP-Agent2]:10050->[IP-Proxy]:50406: i/o timeout
cannot process incoming connection: read tcp [IP-Agent2]:10050->[IP-Proxy]:50484: i/o timeout
cannot process incoming connection: read tcp [IP-Agent2]:10050->[IP-Proxy]:64882: i/o timeout

Do I need to map additional ports on my proxy container?

Have you encountered this problem before?

Thanks to the community

[tbala]

Hello community,

Has anyone encountered this problem before?

To added more information to my problem.
When there is too much time out, the Zabbix agent is seen by Zabbix serser as unavailable :

Get value from agent failed: cannot connect to [[@IP-Agent2]:10050]: [4] Interrupted system call" then returns to normal a few minutes after.

Below is the Zabbix passive proxy docker-compose with these custom environment variables:

docker-compose_v3_centos_mysql_latest.yaml

version: '3.5'
services:
 zabbix-proxy-mysql:
  image: zabbix/zabbix-proxy-mysql:centos-6.0-latest
  ports:
   - "10051:10051"
  volumes:
   - ./zbx_env/usr/lib/zabbix/externalscripts:/usr/lib/zabbix/externalscripts:ro
   - ./zbx_env/var/lib/zabbix/modules:/var/lib/zabbix/modules:ro
   - ./zbx_env/var/lib/zabbix/enc:/var/lib/zabbix/enc:ro
   - ./zbx_env/var/lib/zabbix/ssh_keys:/var/lib/zabbix/ssh_keys:ro
   - ./zbx_env/var/lib/zabbix/mibs:/var/lib/zabbix/mibs:ro
   - snmptraps:/var/lib/zabbix/snmptraps:rw
  ulimits:
   nproc: 65535
   nofile:
    soft: 20000
    hard: 40000
  deploy:
   resources:
    limits:
      cpus: '0.70'
      memory: 1024M
    reservations:
      cpus: '0.3'
      memory: 512M
  env_file:
   - ./env_vars/.env_db_mysql_proxy
   - ./env_vars/.env_prx
   - ./env_vars/.env_prx_mysql
  depends_on:
   - mysql-server
   - zabbix-snmptraps
  secrets:
   - MYSQL_USER
   - MYSQL_PASSWORD
   - MYSQL_ROOT_USER
   - MYSQL_ROOT_PASSWORD
  networks:
   zbx_net_backend:
    aliases:
     - zabbix-proxy-mysql
     - zabbix-proxy-centos-mysql
     - zabbix-proxy-mysql-centos
   zbx_net_frontend:
  stop_grace_period: 30s
  restart: always

.env_prx:

ZBX_PROXYMODE=1
ZBX_SERVER_HOST=@IP-Zabbix_server
ZBX_STARTPOLLERS=200
ZBX_STARTPOLLERSUNREACHABLE=100
ZBX_STARTPINGERS=20
ZBX_STARTDISCOVERERS=30
ZBX_STARTHTTPPOLLERS=10
ZBX_CACHESIZE=128M
ZBX_STARTDBSYNCERS=30
ZBX_HISTORYCACHESIZE=64M
ZBX_HISTORYINDEXCACHESIZE=64M
ZBX_TIMEOUT=10
ZBX_TLSCONNECT=psk
ZBX_TLSACCEPT=psk
ZBX_TLSPSKIDENTITY="PSK ID 001 Zabbix agentd"
ZBX_TLSPSKFILE="zabbix_proxy.psk"

And below is the configuration of the Linux server's zabbix_agent2.conf:

zabbix_agent2.conf

PidFile=/var/run/zabbix/zabbix_agent2.pid
LogFile=/var/log/zabbix/zabbix_agent2.log
LogFileSize=0
Server=@IP-Zabbix_Proxy
ServerActive=@IP-Zabbix_Proxy
Hostname=LINUX-SRV
ControlSocket=/tmp/agent.sock
Include=./zabbix_agent2.d/plugins.d/*.conf

Thanks a lot for your help,

[busk]

Any luck on this? I'm having same issues like this and it is a real PITA. Logs are not helpful. Looking at server issues. You may want to try and eliminate errors that appear in zabbix-server logs. Restart of all zabbix services and database may have helped but not sure. Hopefully we figure this out in the next couple of weeks.