It's possible that your ISP is blocking some Amazon EC2 IP ranges, which would appear this way.

These are the current amazon-owned ranges that contain something you need to be able to connect to for AL:

3.0.0.0/9
3.80.0.0/12
18.128.0.0/9
52.32.0.0/11
54.144.0.0/12
54.72.0.0/13
54.80.0.0/12
54.88.0.0/16
100.20.0.0/14
100.24.0.0/13