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SSH stops working
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Barry, Alex, Rave,

Thanks for your reply. It makes sense to check what you suggested (
more memory, NAT table is full, or ARP table is corrupted ).

This problem does not always happen . To be safe than sorry, I just
ordered a 512Mb to put in the router which is in production right now.

I have another same router in development. I am going to use some Linux
boxes, each for simulating one internal network, they will run the
script to change their ip, mac address, to issue some ftp/web access. I
hope this will help finding out the culprit.

Thanks again,


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<(E-Mail Removed)> schrieb im Newsbeitrag
news:(E-Mail Removed)
> Sometimes I cannot ssh to my router, a c2811 with advanced enterprise
> 12.4.1a, but if I restarts the router then it will work fine again.

Have you thought about this to be some kind of software bug? I mean, it
looks like random unsolicited behaviour whenever it happens. May be its a
bug. I think, may be you should try another release (e.g. 12.4.2T).

Extra information:

12.4.1a is a limited deployment IOS, while 12.4.2T is early deployment:

"Early Deployment (ED) ---
Software releases that provide new features and new platform support
*** in addition to bug fixes. ***"

"Limited Deployment (LD) ---
A Major Release of Cisco IOS software is said to be in the "Limited
Deployment" phase of its lifecycle during the period between initial FCS and
the General Deployment (GD) milestones."

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This problem just happened again. And I just found out that I set the
vtys only from 0 to 4, and I used all of them.

After extending this number, I am able to ssh to the router again.


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adm123 adm123 is offline
Junior Member
Join Date: Mar 2012
Location: NY
Posts: 1
Hi all,

I have a weird behavior on my Cisco router here. I had to restart it for password recovery. Post restart, the config was restored from backup and since then SSH to router comes back with "Connection refused". I can telnet however.

I have several VTY lines, all with preferred transport mode as SSH:
line vty 0 4
exec-timeout 9 20
transport preferred ssh
transport input telnet ssh
line vty 5 15
exec-timeout 9 20
transport preferred ssh
transport input telnet ssh
line vty 16
exec-timeout 9 20
password 7 0945401A0D041B1E
transport preferred ssh
transport input telnet ssh

I have identical config on several other branch routers (2800) and it works fine. OS version is Version 15.1(4)M2
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