Disable the inbuilt firewall on your Windows instances.
Use the IP address rather than the DNS entry.
Create a security group for tcp ports 1 to 65000 and for source 0.0.0.0/0. It's obviously not to be used for production purposes, but it will help avoid the Security Groups as a source of problems.
Check that you can actually ping your server. This may also necessitate some Security Group modification.
Check what security group you are using for your instance. See value of Security Groups column in row of your instance. It's important - I changed rules for default group, but my instance was under quickstart-1 group when I had similar issue.
Go to Security Groups tab, go to Inbound tab, select HTTP in Create a new rule combo-box, leave 0.0.0.0/0 in source field and click Add Rule, then Apply rule changes.
For those of you using Centos (and perhaps other linux distibutions), you need to make sure that its FW (iptables) allows for port 80 or any other port you want.
See here on how to completely disable it (for testing purposes only!). And here for specific rules
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这实际上非常简单：
This is actually really easy:
一些快速提示：
Some quick tips:
对于那些使用 Centos（或许还有其他 Linux 发行版）的用户，您需要确保其固件 (iptables) 允许端口 80 或您想要的任何其他端口。
请参阅此处了解如何完全禁用它（仅用于测试目的！）。
此处了解具体规则
For those of you using Centos (and perhaps other linux distibutions), you need to make sure that its FW (iptables) allows for port 80 or any other port you want.
See here on how to completely disable it (for testing purposes only!).
And here for specific rules