I can connect via ssh a the router with this configuration. The problem is that I can't connect (the application (putty) display a error message) after I connect at several times. This problem is resolved accessing a the router via console and perform the following command (delete the rsa key and generate this key again):
Sounds like the session isn't disconnecting properly. Are you just closing the PuTTY window, or are you actually typing "quit" at the router prompt? If you login a second time and do a "sho users", do you still see the old session in there (will probably be on vty 0)? Basically you can only connect 5 times and use up the 5 VTY ports before you won't be able to get in again. If you session is not disconnecting properly then eventually you'll run out of available ports to SSH/telnet into.
I just set up a 2612 with 12.2(11)T and using PuTTY was able to connect and disconnect numerous times. No matter how I disconnected the session would be released from the router almost immediately.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...