Unknown states on Routers and no usable data?

[Charles Breite]

Nagios version 2.9 

 

Hey everyone,

 Every few hours our Nagios screen fills with all our Routers and a
state of Unknown. The status information for all of the routers is the
line below. Has anyone seen this issue and know what may be causing it?
They tend to go away quickly but obviously there is something not quite
right. 

 

Serial0/3/0:UP No usable data on file (201  rows): (1 UP):UNKOWN  

 

This error is always the same?

 

Thanks for any help

 

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