[erlang-questions] snmpcl timeout problem

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Hi All,
I try to monitor remote machines SNMP oids, Python, Java walk well, but while I use the snmpcl sample demo on github, each time give me fellowing error.   

Eshell V5.10.4  (abort with ^G)
1> application:start(snmpcl).
ok
2> snmpcl:walk("172.24.3.5", [1,3,6,1,4,1,2606,4,2,4,5,2,1,5,14]).
ok
3> 
=ERROR REPORT==== 19-Jan-2015::13:15:24 ===
Can't send request to 172.24.3.5 due to {timeout,1028266095}
 
Can anyone help me regarding this? Thanks.
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