Why do i receive error 56 ?

Question

I am using SNMP toolkit by viodia..And I  am getting an error code 56 while snmpgetrequest, which involves a UDP write and read? I am trying to get the manage UPS. And when i am trying to get data from the UPS i am getting this error? 
 What could be the reason?
Santosh Chavan
IIT MADRAS.

Answer 1

csantosh wrote:
I am using SNMP toolkit by
viodia..And I  am getting an error code 56 while snmpgetrequest,
which involves a UDP write and read? I am trying to get the manage UPS.
And when i am trying to get data from the UPS i am getting this
error? 
 What could be the reason?
Read the
error description for error 56 and you will find it is a network
timeout error. You usually get this from TCP Open functions when no
target answers the connection request, or from both UDP and TCP read
when the addressed device did not respond. With UDP this usually means
that the UDP Write was not sent to the right device address or the
command contained a syntax error so that the device could not decode it
and decided to not send any response.
Another possibility is that you try to  address a device that is
logically on a different subnet than the computer you are sending it
from. The computer will then send the packet to its default gateway and
that might be on a network adapter that has no physical connection with
the actual device. Check your network setup, for instance I had
recently a computer set to 192.168.0.1 with network mask 255.255.255.0
and tried to send an UDP packet to 192.168.10.200 and I never got a
resonse. After changing the device to have 192.168.0.200 everything
worked fine. Alternatively changing the network adapter network mask to
255.255.0.0 would have helped too.
Rolf Kalbermatter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions