This topic provides answers to frequently asked questions when you connect to an Elastic Compute Service (ECS) instance.

FAQ before a purchased instance is connected

Question Solution
Where is the entry point? How do I choose a connection method?
What do I do if I do not know or forget my password?

FAQ about the configurations of a security group if an instance cannot be connected

Question Solution
How do I configure security group rules?

FAQ about failure to connect to a Linux instance

Question Solution
What do I do if I cannot connect to a Linux instance?
What do I do if a common error occurs when I use SSH to connect to a Linux instance?

FAQ about failure to connect to a Windows instance

Question Solution
What do I do if I cannot connect to a Windows instance?
What do I do if a common error message is prompted when I connect to a Windows instance?

FAQ about Virtual Network Computing (VNC) connection

Question Solution
VNC connection
Browser support

FAQ after an instance is connected

Question Solution
What do I do if an exception occurs after I connect to an instance?
What do I do if an exception occurs when I access a website or an application?

Failure to ping an instance

Question Solution
What do I do if I cannot ping an ECS instance?

Other FAQ about common tools

Question Solution
Which tools can I use to connect to an instance and transfer files? Commonly used connection and data transfer tools for Linux instances
What do I do if my website is inaccessible? Check whether TCP port 80 is available