I got this error on zabbix_get execution:

zabbix_get [25820]: Get value error: cannot connect to [[xxx.xxx.xx]:10050]: [13] Permission denied

I've two address configured to point to my server 192.168.2.71: xxx.xxx.xx and yyy.yyy.yy.

But, yyy.yyy.yy is configured as a reverse of my server 192.168.2.71. So, If I exec zabbix_get on yyy.yyy.yy or 192.168.2.71, it works perfectly.

Then, I sugest to only validate the existance of a reverse, not if it exists and the dns address is the same as requested.