Most of the time, your Internet Service Provider or Internet router blocks certain ports for various reasons. Blocking can apply to either incoming or outgoing traffic. It can be for both. To find out what outgoing ports are blocked, here is a simple way to do it. You would simply go to this website and specify the port that you want to connect to the webserver hosting this site. For example, you want to know if port 1000 is blocked by your ISP because there is an application that uses this port to go out to the Internet from your local network. After you have verified that your own local routers do not block this port, you would go to this site by typing in this in the URL of the web browser:
http://portquiz.net:1000
This is what I get when I do this.
Outgoing port tester
This server listens on all TCP ports, allowing you to test any outbound TCP port.
You have reached this page on port 1000.
Your network allows you to use this port. (Assuming that your network is not doing advanced traffic filtering.)
Network service: unknown
Your outgoing IP: [This is your local ISP-assigned IP]
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