SNMP Network discovery not working - zbx_snmp_get_values():NETWORK_ERROR

[erore]

On Zabbix 5.0.2, when I setup network discovery rule:



I never get any discoveries in Monitoring->Discovery. Ping and SSH work fine.

I increased the log level on the discoverer process to debug and here is the result of the discovery attempt for the ip:

24657:20200729:143456.700 process_rule() ip:'192.168.1.9'
24657:20200729:143456.701 query [txnlev:0] [select dcheckid,type,key_,snmp_community,snmpv3_securityn ame,snmpv3_securitylevel,snmpv3_authpassphrase,snm pv3_privpassphrase,snmpv3_authprotocol,snmpv3_priv protocol,ports,snmpv3_contextname from dchecks where druleid=8 order by dcheckid]
24657:20200729:143456.701 In process_check()
24657:20200729:143456.701 process_check() port:161
24657:20200729:143456.701 In discover_service()
24657:20200729:143456.701 In substitute_simple_macros_impl() data:'PUBLIC'
24657:20200729:143456.701 In substitute_key_macros_impl() data:'1.3.6.1.2.1.1.5.0'
24657:20200729:143456.702 End of substitute_key_macros_impl():SUCCEED data:'1.3.6.1.2.1.1.5.0'
24657:20200729:143456.702 In get_values_snmp() host:'' addr:'192.168.1.9' num:1
24657:20200729:143456.702 In zbx_snmp_open_session()
24657:20200729:143456.702 SNMP [[email protected]:161]
24657:20200729:143456.702 End of zbx_snmp_open_session()
24657:20200729:143456.702 In zbx_snmp_process_standard()
24657:20200729:143456.702 In zbx_snmp_translate() OID:'1.3.6.1.2.1.1.5.0'
24657:20200729:143456.702 End of zbx_snmp_translate() oid_translated:'1.3.6.1.2.1.1.5.0'
24657:20200729:143456.702 In zbx_snmp_get_values() num:1 level:0
24657:20200729:143504.706 zbx_snmp_get_values() snmp_synch_response() status:2 s_snmp_errno:-24 errstat:-1 mapping_num:1
24657:20200729:143504.706 End of zbx_snmp_get_values():NETWORK_ERROR
24657:20200729:143504.712 End of zbx_snmp_process_standard():NETWORK_ERROR
24657:20200729:143504.712 In zbx_snmp_close_session()
24657:20200729:143504.712 End of zbx_snmp_close_session()
24657:20200729:143504.712 getting SNMP values failed: Timeout while connecting to "192.168.1.9:161".
24657:20200729:143504.712 End of get_values_snmp()
24657:20200729:143504.712 discovery: item [1.3.6.1.2.1.1.5.0] error: Timeout while connecting to "192.168.1.9:161".
24657:20200729:143504.712 End of discover_service():FAIL
24657:20200729:143504.712 End of process_check()
24657:20200729:143504.712 query [txnlev:1] [begin;]
24657:20200729:143504.713 In DBlock_record()
24657:20200729:143504.713 query [txnlev:1] [select null from drules where druleid=8 for update]
24657:20200729:143504.713 End of DBlock_record():SUCCEED
24657:20200729:143504.713 In process_services()
24657:20200729:143504.713 query [txnlev:1] [select dcheckid from dchecks where dcheckid=10 order by dcheckid for update]
24657:20200729:143504.714 In discovery_update_service() ip:'192.168.1.9' dns:'' port:161 status:1 value:''
24657:20200729:143504.714 In discovery_register_host() ip:'192.168.1.9' status:1 value:''

The problem seems to be in:

24657:20200729:143504.706 zbx_snmp_get_values() snmp_synch_response() status:2 s_snmp_errno:-24 errstat:-1 mapping_num:1
24657:20200729:143504.706 End of zbx_snmp_get_values():NETWORK_ERROR
24657:20200729:143504.712 End of zbx_snmp_process_standard():NETWORK_ERROR

However,

snmpget -v 1 -c public 192.168.1.9 1.3.6.1.2.1.1.5.0

returns

SNMPv2-MIB::sysName.0 = STRING: SW9

Can this be debugged a little deeper, specifically, what is happening in

zbx_snmp_get_values

that it returns the error. Am I missing some tools or is this a bug?

Also, if I add the host manually, the SNMP values seem to be read (specifically the OID used for discovery is read correctly in an added host).

[Radboud]

You use uppercase PUBLIC in the snmp community string in the item config,
but on the command line you use lowercase public as the community string

SNMP community strings are case sensitive.

[erore]

How dumb of me. Thank you.

[Radboud]

No Problem

we all have those days