Error connecting cisco 871 to pptp server. What could be the problem?

Question

Cisco

Good afternoon!
I have such a problem - there was a working configured cisco 871 router, configured as a pptp client. Everything connected and worked. I decided to update his ios. Updated, and after a reboot it stopped connecting to the pptp server. Ok, I reverted the old image, which connected an hour ago, and nothing. Connection does not occur.
Writes

Jul 10 18:49:41.359: Vi1 PPP: Using dialer call direction
Jul 10 18:49:41.359: Vi1 PPP: Treating connection as a callout
Jul 10 18:49:41.359: Vi1 PPP: Session handle[DC0005DD] Session id[862]
Jul 10 18:49:41.359: Vi1 PPP: Authorization required
Jul 10 18:49:41.359: Vi1 PPP: No remote authentication for call-out
Jul 10 18:49:41.363: Vi1 PPP: No authorization without authentication
Jul 10 18:49:41.363: Vi1 CHAP: I CHALLENGE id 1 len 34 from "KerchNET-Plus"
Jul 10 18:49:41.367: Vi1 CHAP: Using hostname from interface CHAP
Jul 10 18:49:41.367: Vi1 CHAP: Using password from interface CHAP
Jul 10 18:49:41.367: Vi1 CHAP: O RESPONSE id 1 len 33 from "knd-vpn-2607"
Jul 10 18:49:41.375: Vi1 CHAP: I FAILURE id 1 len 28 msg is "bad username or password"ter no

But the config didn't change! I checked the username and password - they match what should be. What could be the problem?

Answer 1

Everything turned out to be simple. The subscription ended a couple of days ago. Until I terminated the connection, it worked quietly for itself.

Answer 2

But the config didn't change!

Did not literally change or did you re-upload it through the terminal (copy-paste) after flashing? In the second case, check if there are any extra spaces in the login/password (at the end).