Steps to reproduce:

• configure host "SERVER085" on Server
• configure agent for hostname "server085"
• start agent and watch agent getting list of active checks
• see server log, that host sends data and stopps after "In check_security()"

Cause:

• in trapper.c there is a strcmp against item.host_name and values[i].host_name in process_mass_data which compares case-sensitive and silently ignores data.
• mysql server doens't care about case-sensitiveness

Workaround:

• fix hostname case on server or agent

Notes:

• version 1.4.x ignored hostname case-mismatches

ZABBIX Server log :
27554:20090930:090851 Trapper got [<req><host>...</host><key>...</k
ey><data>...</data></req>] len 108
27554:20090930:090851 In process_mass_data()
27554:20090930:090851 Query [select i.itemid,i.key_,h.host,h.port,i.delay,i.description,i.nextcheck,i.type,i.
snmp_community,i.snmp_oid,h.useip,h.ip,i.history,i.lastvalue,i.prevvalue,i.hostid,h.status,i.value_type,h.erro
rs_from,i.snmp_port,i.delta,i.prevorgvalue,i.lastclock,i.units,i.multiplier,i.snmpv3_securityname,i.snmpv3_sec
uritylevel,i.snmpv3_authpassphrase,i.snmpv3_privpassphrase,i.formula,h.available,i.status,i.trapper_hosts,i.lo
gtimefmt,i.valuemapid,i.delay_flex,h.dns,i.params,i.trends,h.useipmi,h.ipmi_port,h.ipmi_authtype,h.ipmi_privil
ege,h.ipmi_username,h.ipmi_password,i.ipmi_sensor,i.lastlogsize from hosts h, items i where h.hostid=i.hostid
and h.proxy_hostid=0 and h.status=0 and i.status in (0,3) and i.type in (2,7) and ((h.host='server085' and i.ke
y_='agent.version')) and h.hostid between 5100000000000000 and 5199999999999999]
27554:20090930:090851 In substitute_simple_macros (data:"agent.version")
27554:20090930:090851 In check_security()
27554:20090930:090852 Trapper got [<req><host>xxxx</host><key>xxxxxx</k
ey><data>xxxxx</data></req>] len 100