Proxy problem

[kostya2]

I am having a problem where no new data shows up for all the hosts configured to use one of my proxies. Last date for the data is May 10 for all the hosts and that was the date when the proxy and all or majority of the hosts using this proxy were patched to RedHat 2.6. This is the same patch that was applied to other hosts and other proxies and all of them still work fine. zabbix_get seem to work:

zabbix_get -s de1uommdb01 -k agent.version
1.8.2

clients appear to listen on port 10050 and proxy on 10051. I can get on port 10051 from proxy to server and from server to proxy. zabbix_proxy.log isn't very helpful or maybe I don't know what to look for. zabbix_server.log is set to DebugLevel of 2 and doesn't have any errors. I spot checked underlying mysql database and none of the hosts I tried have any data in history or history_uint tables (retention is set to 30 days and May 10 is over 30 days now).
Zabbix server, proxy and clients are at 1.8.2.
How do I troubleshoot this?
Thanks in advance for any help/suggestions.

[tvari]

When you switched those hosts over to the proxy, did you update their agent configs aswell? Pretty sure you need to add the hostname or IP address of the proxy to the "Server=" field in the agent config.

[kostya2]

When you switched those hosts over to the proxy, did you update their agent configs aswell? Pretty sure you need to add the hostname or IP address of the proxy to the "Server=" field in the agent config.

Yes, agentd.conf points to the proxy. It used to work fine for a long time before May 10.

[kostya2]

Comparing netstat -a outputs shows that one side (zabbix server) sees connections established with the proxy but the proxy does not see the connections. Port 10051 appear to be open from proxy to server and from server to proxy. There is no firewall between the proxy and its clients and clients do respond with data when queried with zabbix_get from the proxy. Are there any other ports besides 10051 that need to be open between a proxy and a server?

[kostya2]

It looks like server does see the proxy (according to "Configuration of Proxies" screen). I can also force a single instance of icmpping check to show up in server by deleting a client from a proxy and assigning it back. However icmpping check is the only data that shows up in the server (and only once) - all other zabbix agent items still show the date of May 10. Anybody has any idea how to troubleshoot this?