0
votes
1answer
59 views

How do programs acess the internet? [closed]

Just out of curiosity, how do programs acess the internet? For example, Icloud is a program by apple that automatically syncs photos, notes, etc. from an apple device to a pc through a wireless ...
3
votes
4answers
3k views

Default Open ports in router?

In order for my computers at work (behind a main router) to be able to browse to internet - which ports (minimum) should I keep open to let them browse the internet ? is it just 80 , 443 ?
1
vote
2answers
983 views

Can't connect over internet but port is open

I trying to connect to my own computer over internet over port 3389, when i go to site yougetsignal can see that on my external ip port is open for sure. Also on firewall options Remote Assitance is ...
5
votes
1answer
1k views

Why are ports 30000 to 60000 needed when browsing the net

Why are these iptables rules preventing me from browsing the net? iptables -A INPUT -i eth0 -p tcp --dport 30000:60000 -m state --state NEW,ESTABLISHED -j DROP iptables -A OUTPUT -o eth0 -p tcp ...
3
votes
1answer
199 views

Why is my system using port 4?

I have Windows 7 and have noticed that my system is using port 4 to connect to a lot of different IP addresses. When it connects to them it is not for very long before it moves to another IP address. ...
2
votes
4answers
1k views

Does port forwarding a port on one computer expose other computers in the network as well?

I have read that port forwarding exposes your computer to security breaches. Does port forwarding a port on one computer expose other computers in the network as well?
4
votes
1answer
826 views

What is the purpose of ports?

I have a few questions in regard to the following explanation of ports I found. The Application layer talks to the Transport layer through a port. Ports are numbered and standard ...
1
vote
2answers
652 views

Seeing which ports can be used for bittorrent

I am connected to the Internet through a router that I forgot the password to. So I can't open up ports like usual. How can I scan for open ports that I can use for bittorrent? I would like to use a ...
0
votes
1answer
187 views

Client connections always use an ephemeral port?

When a client connects to something on the internet, does it always connect from an ephemeral port? Are all the well-known ports only used by servers?
1
vote
1answer
125 views

Unstable network connection, port 41112

I have a problem with stability of my internet connection. I use a router for my home LAN (Asus WL-500gP V2). Recently, i've seen there are many "denied" log entries so i thought maybe the problem is ...
1
vote
1answer
968 views

trying to access Google server on different ports

Why is that http://www.google.com:443/ fails almost instantaneously, while http://www.google.com:8080/ takes some more time before failing? If there is no server on these ports, both the ...
4
votes
3answers
3k views

How does seeding in uTorrent work if I don't forward any ports?

I didn't forward any ports on my router yet I can still seed in uTorrent. I'm curious as to how this works, because maybe this can give me insight into how I can host Battle.net games without port ...