Can't Connect Cisco 2800

Can't Connect Cisco 2800

Hello - Guys .. I'm Using Netflow Analyse am new user and iam in evaluation period - really this software seems great and i like it. if this work me i will urgently ...

My Problem
Ia'm using Cisco 2800 and i do a lot of configuration through snmp that Manage Engine send me to configure the router ..
the problem is and can't connect to the Router and replies me Request Time Out ..
if i use - it says can't apply invalid username ..
please help urgent
 thank very much

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