That's a short living file. It was probably removed by the time you looked there.

As I indicated on ZBX-7054, you have modified parts of your installation, mixed repositories and also set up some weird things. Sort that out first, particularly fping.

I succeeded to reinstall iksemel from epel, but the pinger files won't be created

# yum list installed | grep zabbix
libssh2.x86_64        1.4.2-2.el6       @zabbix-non-supported
zabbix20.x86_64       2.0.8-1.el6       @epel
zabbix20-agent.x86_64 2.0.8-1.el6       @epel
zabbix20-server.x86_64
zabbix20-server-mysql.x86_64
zabbix20-web.noarch   2.0.8-1.el6       @epel
zabbix20-web-mysql.noarch
# yum list installed | grep fping
fping.x86_64          2.4b2-10.el6      @epel
# yum list installed | grep iksemel
iksemel.x86_64        1.4-2.el6         @epel

Next issue: I failed to remove libssh2 (see yum_remove_libssh2_130926.txt attached). Please let me know how to proceed further.

Created attachment 803529 [details]
Logs while libssh2 removal failed

I succeeded to remove libssh2 with --nodeps option, but since then is yum broken. Now I struggle to reinstall libssh2, could you provide any advice pls?

# rpm -e --nodeps libssh2
# rpm -qa | grep libssh2

# yum install libssh2
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

   libssh2.so.1: cannot open shared object file: No such file or directory

Please install a package which provides this module, or
verify that the module is installed correctly.

It's possible that the above module doesn't match the
current version of Python, which is:
2.6.6 (r266:84292, Jul 10 2013, 22:48:45)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-3)]

If you cannot solve this problem yourself, please go to
the yum faq at:
  http://yum.baseurl.org/wiki/Faq

Please ignore the previous comment, I fixed yum after libssh2 rpm installation:

# rpm -ivh http://mirror.centos.org/centos/6/os/x86_64/Packages/libssh2-1.4.2-1.el6.x86_64.rpm

Hence I checked there were no zabbix or fping packages installed, thus I proceed:

# yum install  zabbix20-server zabbix20-web zabbix20-agent zabbix20-get zabbix20-sender
# yum list installed | grep zabbix
zabbix20.x86_64       2.0.8-2.el6       @epel
zabbix20-agent.x86_64 2.0.8-2.el6       @epel
zabbix20-server.x86_64
zabbix20-server-mysql.x86_64
zabbix20-web.noarch   2.0.8-2.el6       @epel
zabbix20-web-mysql.noarch

fping is installed automatically during this operation, being a zabbix-server dependency:

# yum list installed | grep fping
fping.x86_64          2.4b2-10.el6      @epel

In conclusion I followed your suggestion, I re-installed all zabbix packages with yum, but the issue is still there, the pinger files are not generated.

It seems fping has been blocked by selinux, the following logs drived me to this:

# tail -f /var/log/audit/audit.log |grep -i avc
type=AVC msg=audit(1380529975.252:86142): avc:  denied  { read } for  pid=25650 comm="fping" path="/tmp/zabbix_server_23950.pinger" dev=md2 ino=23986186 scontext=unconfined_u:system_r:ping_t:s0 tcontext=unconfined_u:object_r:initrc_tmp_t:s0 tclass=file
type=AVC msg=audit(1380529976.253:86143): avc:  denied  { read } for  pid=25661 comm="fping" path="/tmp/zabbix_server_23954.pinger" dev=md2 ino=23986186 scontext=unconfined_u:system_r:ping_t:s0 tcontext=unconfined_u:object_r:initrc_tmp_t:s0 tclass=file

After I disabled selinux, the pinger files were created and the issue disappeared:
# setenforce 0

I disabled selinux before installing the rpm packages for zabbix, but probably after a reboot it has been re-enabled and by mistake I suspected the yum packages to be guilty.

Take a look at the README file in the base package concerning SELinux. By the way, the pinger files should now go to /var/lib/zabbixsrv/tmp. I think that won't trigger SELinux, but I'm not sure.