This could potentially be a number of issues. But Windows can show this error if you have any VPNs running that have the “Kill Switch” enabled. You can either add the local range as an exception, or not enable the Kill Switch.
This means vty is essentially like a virtual computer screen plugged into the router that we can remotely access.
Both SSH and Telnet use this virtual monitor to let you see the router/switch.
line vty 0 4
Configures 5 of these virtual teletypes (vty’s) for us to use. Can think of it having 5 monitors connected to the router. When you SSH to it, you are claiming one of these monitors. Cisco devices support up to a maximum of 16. 0-15
Authentication, Authorization, and Accounting or AAA is an framework that allows access to a computer network/resource,
Authentication identifies the user. It’s from the Greek authentikos “real, genuine”. We can think of it as proving the identity of the user. Bob sits down at the computer and types in his password (Something he knows) and confirms that he is in fact Bob.
Authorization is the privileges that the user has to the system. For instance, Bob is now authenticated to the computer, but he may only be authorized to access email and a web browser.
Authorization and Authentication can get confusing. In simple terms
Authentication – Who are you?
Authorization – What you have access to.
Accounting is the auditing or logging arm of AAA. It is for answering the 5 Ws Who did what, when, where, and how. For instance, accounting could log that Bob checked his email at 9:30AM, Improved his mind by reading posts on incredigeek.com for a couple hours, then checked email again before shutting the computer down.
Hopefully that is a short helpful explanation of AAA. For more information, check out the following links.
This error can show up on Windows if you have already copied a file with the same name. To fix the issue, just copy it to a file with a different name. Change cap.pcap to cap1.pcap and so forth as needed.