Catalyst 3750G can not connect via terminal/console port

[DC1966]

I have two 3750G switches, one I can connect to via the terminal/console port using Putty, the other I can not. I have connected a couple of servers and PCs to the troublesome switch and it works OK. Does anyone have suggestions why I can not establish a connection with this switch? I have tried all the baud rates but it still does not connect. Are there license or OS issues I need to be aware of? The other switch connects no problem so I know the connecting setup is working.

[Giuseppe Larosa]

Hello @DC1966 ,

is the switch configured for allowing telnet or SSH connections ?

In some cases for software bugs that cause memory leakage a switch can be so bussy that it can not allocate memory for a telnet/SSH session or even a console session.

If you can try to reboot the switch and try again.

if the problem is a memory leakage it takes many hours of uptime to consume the memory.

Hope to help

Giuseppe

[DC1966]

Making this post to close this question:

Decided to open the switch to see if there was an obvious mechanical or electrical reason the console port was not working. Discovered a small chip adjacent to the port badly burnt.

[Giuseppe Larosa]

Hello @DC1966 ,

thanks for your feedback!  so it was an hardware issue the chip that was burnt is probably the UART that manages the console async serail port.

Hope to help

Giuseppe

[paul driver]

Hello

Thank you for the feedback, I have never come across such a problem as this before regarding the root cause is hardware pertaining to the console port, so good to know.