We recently upgraded an 831 router to IOS 12.3(14)T5. I consoled into the router via my PC/Hyperterminal to tftp the startup config. I copied the startup to the router via tftp, reloaded the router and even before I could get to the logon prompt, I lost connection in hyperterminal. The only way at that point I can get into the router is via dialup. I went ahead and erased the config, reloaded and was able to console in again via the PC. I went ahead and copied the config again but this time I removed all exec-timeouts from the console, aux and vty lines. I reloaded and same issue occurred. Ever since we've upgraded the IOS this problem occurs. A few questions: Is there an issue with 831's and IOS 12.3(14)T5 like this one? If so, is there a workaround? Can I downgrade the IOS to a lower version like 12.3(11)T5 and not cause any issues to the router? Thanks for the help.
I have this problem too.