On 13 Apr 2006 09:48:08 -0700, "webwolf_3000" < XXXX@XXXXX.COM >
Many ISPs will block INBOUND TCP port 80 packets that have the SYN
flag set. The SYN flag means that the packet is a request for a
In other words, many ISPs will not let residential users run web
servers (per their terms of service) and they enforce that stance by
blocking the inbound requests to web servers.
When he uses http://www.yqcomputer.com/
, that resolves his target to
an IP address. His router is smart enough to realize that the address
is the same as its own address, so it routes the request back into the
network - without ever getting into the ISPs system.
Bottom line: if you have a residential system, you probably have to
run your server on a non-standard TCP port in order to make it work.
Then, realize that you may be violating your ISP's TOS and may be
subject to having your account cancelled if they wanted to get *** .
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