Agent Connection Issue behind NAT

[vsimoes]

Hello,

I am experiencing issues when i am trying to setup the Zabbix Agent behind NAT routers, basically when i start the service at client side everything seems to happen right, i can even see the graphics in the server interface, but in 10 minutes or less the connection stops and never work anymore.

*The issue happens when i am trying to reach zabbix server without using the Zabbix proxy.

*It happens in many clients, not just one.

*When i use Zabbix Proxy, everything goes fine.

*It happens behind Zentyal, PFSense or any other gateway solution.

*Tried passive and active setups.

I am using Zabbix 3.

Here is the client log:

9356:20160425:173040.612 Starting Zabbix Agent [SRV-SIGADM]. Zabbix 3.0.0 (revision 58455).
9356:20160425:173040.612 **** Enabled features ****
9356:20160425:173040.612 IPv6 support: YES
9356:20160425:173040.612 TLS support: NO
9356:20160425:173040.612 **************************
9356:20160425:173040.612 using configuration file: C:\zabbix_agentd.conf
9356:20160425:173040.612 agent #0 started [main process]
9204:20160425:173040.612 agent #1 started [collector]
8716:20160425:173040.612 agent #3 started[listener #2]
10180:20160425:173040.612 agent #2 started[listener #1]
7812:20160425:173040.612 agent #5 started [active checks #1]
9352:20160425:173040.612 agent #4 started[listener #3]
7812:20160425:173044.153 active check configuration update from [CENSOREDADDR:10051] started to fail (ZBX_TCP_READ() failed: [0x0000274C] A connection attempt failed because the connected party did not answer properly after a period of time, or established connection failed because connected host has not responded.)

[kloczek]

[..]
*Tried passive and active setups.
[..]
Here is the client log:
[..]
9356:20160425:173040.612 using configuration file: C:\zabbix_agentd.conf
9356:20160425:173040.612 agent #0 started [main process]
9204:20160425:173040.612 agent #1 started [collector]
8716:20160425:173040.612 agent #3 started[listener #2]
10180:20160425:173040.612 agent #2 started[listener #1]
7812:20160425:173040.612 agent #5 started [active checks #1]
9352:20160425:173040.612 agent #4 started[listener #3]

Above shows that you are using passive agent (started listener processes).
From behind NAT only may work active agent as agent process from behind NAT-gw connects to server/proxy. To switch to active setup you need to add in agent setup:

StartAgents=0
ServerActive=<your.proxy.or.server.ip.or.hostname>

[vsimoes]

Thanks for the answer, but as i said, i already tried it active and same issue still happening.