Is it an ISDN router? Console ports have a tendancy to not work after someone has plugged an ISDN line into them by mistake (yum smell that ozone). Sorry to state the obvious but it used to happen a lot when I worked at a Telco.
The other possibility, if its an up and in service router, is that its run out of memory. A neat trick with that is to unplug an interface cable for a split second. That frees up buffer memory (when the interface goes down) and gives you a few seconds before it gets used up again to log in.
I had the same problem once. I finally learned that it was a baud rate problem. The router was configured with a buad rate that my computer did not support . I assume that this was for security. I had to use the console reset jumper on the motherboard to reset the routers console port to 9600. Here is a link that explains how to do this. Hope it works. http://www.cisco.com/warp/public/701/59.html
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...