[mrtg] problem about External Monitoring Scripts

[Íõѧ¾ü]

hey, this time I applied an external monitoring script to monitor a single value
 that snmp can't provide directly. when I ran mrtg to generate the data for the 
target log manully, it appeared very good, and I could browse the right graph from
IE with the right target name and system uptime. but when the mrtg was 
automatically run by crontab, all data of target log turned 1 or -1, and target
name and system uptime of IE became unknown, the graph could tell nothing but 
wrong data. when i manully ran the task of crontab, all things seemed ok again. 
Could anybody tell me why it would be that? Is there anything I should be 
careful? Thanks a lot!


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