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port forwarding (on port 3389) on a Cisco C881-K9 V01

Mvuvi
Beginner
Beginner

Hi,

 

I configured port forwarding (on port 3389) on a Cisco C881-K9 V01 router (currently using Cisco IOS Software Release 15.4). It worked fine for a while, then stopped. Through console I went through the config and confirmed it was set up right. It surprisingly worked again for a while and again stopped (left me clueless). 

 

I've tried to telnet to confirm whether the port is open from a remote network and the connection refuses. What could be the issue? 

1 Accepted Solution

Accepted Solutions

Mvuvi
Beginner
Beginner

Thanks @marce 1000 and @Georg Pauwen. I found out the problem was I forgot to save the changes I'd made to the config to allow for remote desktop connection. When there was a power blackout (happens frequently here in Kenya) and the UPS was faulty, then the console reset back to the initial config.

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3 Replies 3

marce1000
VIP Mentor VIP Mentor
VIP Mentor

 

 - Could be a bug , you may try with a Suggested  (software) Release for this platform.

 M.



-- ' A nun once asked a penguin ' do you think the earth is flat ? ; the penguin replied :
Madam, it all depends , in Riemann geometries the earth can be perfectly flat! The nun thanked him , he tripped and fell forward : the poor animal had forgotten that he might be living in a Riemann geometry too!

Georg Pauwen
VIP Master VIP Master
VIP Master

Hello,

 

hard to tell what is causing this. You could try and exclude the static 3389 translation from the dynamic NAT. Below is an example (IP addresses are arbitrary):

 

ip nat inside source static tcp 192.168.1.10 3389 interface GigabitEhernet0/0 3389
ip nat inside source static udp 192.168.1.10 3389 interface GigabitEthernet0/0 3389
ip nat inside source list 101 interface GigabitEthernet0/0 overload
!
access-list 101 deny tcp host 192.168.1.10 any eq 3389
access-list 101 deny udp host 192.168.1.10 any eq 3389
access-list 101 permit ip 192.168.1.0 0.0.0.255 any

Mvuvi
Beginner
Beginner

Thanks @marce 1000 and @Georg Pauwen. I found out the problem was I forgot to save the changes I'd made to the config to allow for remote desktop connection. When there was a power blackout (happens frequently here in Kenya) and the UPS was faulty, then the console reset back to the initial config.

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