First u see the reachability from ur host ip address to router. If it is possible ti reach there & see ACL in ur router. whethere it is permitted or denied from ur system.
Then check ur vty terminal configuration :
Router(config)#line vty 0 4
whether telnet/ssh is allowed on ur router or not.
Router(config-line)#transport input telnet ssh
either u can configure both of them at a time or any one at a time, it depend on ur desire.
Plz pardon me, if i left anything overhere to tell u.
You need to check NAT translations. Your access-list for NAT most likely looks like below:
access-list 100 per ip any any
the source “any” is causing problem. Specify your source address/network(s) in NAT ACL to be site specific. For example, if your LAN is 10.10.10.0/24, use ACL below for NAT.
access-list 100 per ip 10.10.10.0 0.0.0.255 any
Hope this helps.