Zabbix agent (active) log[/var/log/kern.log,"Out of memory"]: Permission denied

[Sergey371]

Add Zabbix agent (active) to Template check: log[/var/log/kern.log,"Out of memory"]
In Configuration->Host->Items see for this key:

Cannot open file "/var/log/kern.log": [13] Permission denied

For some hosts with the same Template all right.
If the cloned key from a template in the local configuration also works.

On problem host:

$ id zabbix
uid=114(zabbix) gid=124(zabbix) groups=124(zabbix),4(adm)
$ ls -l /var/log/kern.log
-rw-r----- 1 syslog adm 731954 апр.  19 12:57 /var/log/kern.log

# su -s /bin/bash - zabbix
zabbix@xxx:~$ wc -l /var/log/kern.log
6827 /var/log/kern.log

Restart the agent, proxy and server has already done.

What to do? How to fix?

Sever: Zabbix 2.4.7 on Ubuntu 14.04.3 LTS
Proxy, Agents: Zabbix 2.4.7 on Ubuntu 12.04.5 LTS

[pzabortsev]

The same problem is with /var/log/syslog file on Ubuntu 14.04.4 LTS

But on Ubuntu 12.04.5 LTS /var/log/syslog file monitoring works fine

Have anybody a solution?

[Sergey371]

Workaround:
From host configuration -> Templates -> Unlink and clear for template witch the problematic Item -> Update
Then add this template(with the problematic Item) again and Update.