I have a 891 router I have been testing some things on. I have been able to successfully telnet to it in the past with no problems. Just yesterday I was trying to set an interface to have an IP of 10.10.10.2 which I realized was an IP I had forgot to exlcude from DHCP and it was handed out to the computer I was using to telnet in. So I wrote in the exlcude commands and did an ipconfig -release ipconfig -renew on my PC that had the 10.10.10.2 IP. After the renew I was given 10.10.10.7 (put in a few more excludes).
However the release dropped my telnet connection and afterwards I was completely unable to telnet in, getting the error that says I cannot open the connection on port 23. I had made some changes to my entire config beforehand which had it switch to use a new public IP. I never saved the changes and did a hard reset by unplugging the router to get my old config back and see if I could telnet after that. Still could not get in, same error. Well I went through and remade my entire config to use the new public IP. My 10.10.10.7 PC can access the internet, DNS, ping the router, all just fine. Still can't telnet. I remade my line/vty config and made sure it matched up with a config I had on another router. Still can't telnet.
Last thing I did was go in and manually clear all open line connections. All that is left is an idle 0 con 0 line that it wont let me close. Still can't telnet.
What the hell is going on with this thing? I am completely at a loss to explain why I cant telnet. It must be something in my ACLs that I am misisng? Please help, I was just about to move this to an environment where I HAVE to access it by telnet!
your vty lines are controlled with an access-list:
line vty 0 4
access-class 23 in
access-list 23 permit 10.10.10.0 0.0.0.7
I believe that access-list will allow clients from 10.10.10.1-10.10.10.6. Try lifting it for a moment (or making the inverse mask 0.0.0.15) to open up telnet to a few more hosts (or make it a set of /32s).
I actually did figure this out on my own. I am wondering why I was able to telnet in with no problem before without the access-list and I am also wondering why my other router, a 1921, also does not have the access-list but I am able to telnet with no problems.
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