[c-nsp] Weird telnet problem on 7204VXR

Mike Bacher isp-list at tulsaconnect.com
Wed Oct 13 08:22:17 EDT 2004

Dennis Peng wrote:
> It's a bug. If you do a "show line vty X", you should see "Ctrl-C
> Enabled" under the "Status" for the line. This causes the Username
> prompt to timeout immediately when you try to use that line. It should
> only effect one of the vty lines (although it may be vty 0 which is
> the worst), but if you telnet back to the router right away, you
> should get another line which should not have this problem. There is
> no way to clear the condition, short of a reload.

Ok, I tried two simultaneous telnet's and got in on one.  Also:

dsl1#show line vty 1
    Tty Typ     Tx/Rx    A Modem  Roty AccO AccI   Uses   Noise  Overruns   Int
      3 VTY              -    -      -    -    -     44       0     0/0       -

Line 3, Location: "", Type: ""
Length: 24 lines, Width: 80 columns
Baud rate (TX/RX) is 9600/9600
Status: Ready, No Exit Banner, Control-c Typed, Ctrl-c Enabled
Capabilities: none
Modem state: Ready

So, it looks like we are being bitten with the ctrl-c "bug" all of a sudden 
(this hasn't been a problem until recently, and its been running for several 
months with this IOS).  Is this problem caused by the previous person that 
connected to that vty using Ctrl-C at some point?

Is there a way just to disable the affected vty line or some other workaround? 
This bug is hosing our ability to auto-provision DSL customers..


Mike Bacher / isp-list at tulsaconnect.com
TCIS - TulsaConnect Internet Services
Phone: 918-584-1100x110 Fax: 918-582-5776

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