I was running a debug command on my router as a user is complaining that he has problem connecting to a server. I asked the user to do a ping from the source to the destination while i ran debug. On the debugs I saw:
6w6d: IP: s=18.104.22.168 (Serial0/0), d=172.18.116.2 (FastEthernet0/0), len 284, encapsulation failed
6w6d: ICMP type=8, code=0
trying to find out what that means but if anyone knows off the top of their head please let me know. Thank you in advance
In my experience of things like this the encapsulation failed error is frequently caused because there is no entry in the ARP table for the destination address. Can you get that person to test again, and if it fails again then check and see if there is an ARP entry for address 172.18.116.2 on interface FastEthernet0/0?
 is it possible that there is a typo in some digit in one of the octets and that this address is really not the correct address for the server?