Cacti doesnt get snmp values

[ckern]

I'm trying to get some simple if-statistics from my mikrotik router, but it seems as cacti didn't get any values.
I can ping my router, also a simple SNMP walk from the commandline of the machine running cacti do work:
snmpwalk -v1 -c gmx459snmp 192.168.1.1 .1.3.6.1.2.1.2.2.1.1 (.1.3.6.1.2.1.2.2.1.2 gives me the correct if-descriptions and so on)
iso.3.6.1.2.1.2.2.1.1.1 = INTEGER: 1
iso.3.6.1.2.1.2.2.1.1.2 = INTEGER: 2
iso.3.6.1.2.1.2.2.1.1.3 = INTEGER: 3
iso.3.6.1.2.1.2.2.1.1.4 = INTEGER: 4
iso.3.6.1.2.1.2.2.1.1.5 = INTEGER: 5
iso.3.6.1.2.1.2.2.1.1.6 = INTEGER: 6
iso.3.6.1.2.1.2.2.1.1.7 = INTEGER: 7
iso.3.6.1.2.1.2.2.1.1.8 = INTEGER: 8

The verbose query gives me the following output:

+ Running data query [1].
+ Found type = '3' [SNMP Query].
+ Found data query XML file at '/usr/share/cacti/site/resource/snmp_queries/interface.xml'
+ XML file parsed ok.
+ Executing SNMP get for num of indexes @ '.1.3.6.1.2.1.2.1.0' Index Count:
+ Executing SNMP walk for list of indexes @ '.1.3.6.1.2.1.2.2.1.1' Index Count: 0
+ No SNMP data returned

There is absolutely no error output in /var/log/cacti/*, neither in the apache/php logfiles.
The device is configured as 'generic snmp enabled host' and snmp v1 in cacti itself, so everything should work.

Can somebody help me or give me a hint?

[phalek]

Do you have selinux enabled ? Apache may not be able to do network connections.

See here: http://docs.cacti.net/manual:088:1_inst ... x_settings

[ckern]

thank you for your input, selinux isn't installed. The system is a debian 8.4 btw.

Edit:
Monitoring the system by itself (localhost) do work btw.

[ckern]

wahhh damn, what a stupid error by myself.
Found the problem, localhost is getting monitored without snmp, that's why it was working and the php snmp module
wasn't activated. Found it as i was taking a look a the cacti technical support page, but maybe a better failure handling
or a detailed output on verbose query would be nice