AWS CloudWatch is a service that lets you monitor and manage your AWS account's and region's deployed applications and resources. It's full with useful tools.
The connection timed out error isn't a dangerous error, nor is it an infected file that can harm your computer. This message primarily serves as a warning that the system has been unable to establish a connection with the server.
A reverse proxy server lies between internal applications and external clients, relaying client requests to the appropriate server.