Why does zabbix server say "Internal check not supported" when checking lastacess zabbix proxy?

Question

linux

Hello. I'm trying to check the time stamp of the last availability notification from the zabbix proxy. When creating an ED with an internal check, I get the error "internal check not supported".
At the same time, the test ED with the zabbix[items] check works correctly. What's the matter?
Zabbix server v2.2.1 (revision 40808) (09 December 2013)

Answer 1

Because the ED that checks the state of the proxy must be added to the zabbix server host, and not to an arbitrary host.

Answer 2

developers.google.com/books/?hl=en , may help

Answer 3

It is possible to suck in from some OPDS catalogs (XML), for example. flibusta.net/opds