I have a strange problem when I use putty 0.60 to connect to the router via ssh: putty occasionally opens a window with error the following message: "Strange Packet Received: type 3" and terminatig comunication with router.
The problem occurs on some recent versions of IOS, in particular the 12.4 (24) and various hardware platforms.
Just a thought if it affects your sessions to some router all of the time.
If your IOS feature set allows it, you could encrypt telnet traffic between your routers and management workstation(s). And then disable SSH untill the problem is fixed.
It's a bit messy and has a high administrative overhead, but it would secure management traffic.
good info... I have turned the information to the mailing list of putty developers where I was reporting a series of log for catch the bug (Simon Tatham had introduced some new flags in the current version to better identify the problem) !!!
Hate to bump an old thread, but this is the top Google search for this error. FWIW we did not start seeing this until we upgraded from c3845-ipbasek9-mz.124-22.T.bin to c3845-entservicesk9-mz.124-24.T3.bin.
Setting the PuTTY rekey interval to 0 (disabling rekey) will help and is still most likely more secure than using telnet..
We have also been seing this problem for a long time with most versions of IOS. Very annoying. Nice to find a work around but it would be even nicer to see this fixed.
In fact I could not say how much of the problem is attributable to IOS, and than it is to Putty; ultimately, when I use ssh on Linux the problem does not occur. There are two things: or openssh already has an automatic workaround or is there something more! At the time, I read the opinion of Simon Tatham: in fact I still lack the position of some Cisco employees on this annoying defect.
