05-10-2019
In general, all traffic on the Internet has a beginning and an end point Often, this is referred to as the client and the server.
The server listens on well known ports. The client generally uses whatever is available.
When you run HTTPD on your machine, it is generally acting as a client, listening on port 80, or port 443 if using SSL.
When you use YUM to access their repo services, their server is generally listening or port 80, or port 442 if using SSL.
So, when you block HTTPD on your computer, you are not blocking that service on another server, like YUM, because to access a repo like YUM or GIT you are acting as a client, accessing a server. When you block or disable HTTPD on your computer, you are simply blocking access to your server, locally.
You should probably do some homework and learn some basics about client-server processes.
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LEARN ABOUT DEBIAN
gems-client
GEMS-CLIENT(1) gems documentation GEMS-CLIENT(1)
NAME
gems-client - Show data transmitted by gems-server (1)
SYNOPSIS
gems-client [-i] host [port]
gems-client -h | -v
DESCRIPTION
Connects to a computer running gems-server(1) to show in the local terminal the data transmitted, in real time.
OPTIONS
host Hostname or IP address where the server is running.
port TCP port used by the server. Default: 6666.
-i Ignore server terminal size. If this option is not supplied, gems-client disconnects itself whenever the local terminal is smaller
than the terminal associated to the server.
-h Show a short help message.
-v Show version information.
FUNCTION KEYS
While gems-client is running, some keys have special functions:
q Quit.
a Enable/disable alarm blocking. When active, if the server transmits an alarm character ('a'), the client ignores it, so the alarm
does not play. This is specially useful when many clients are present in the same room, to avoid the annoying simultaneous beeps.
AUTHORS
Diego Essaya <dessaya@fi.uba.ar>
Emiliano Castagnari <ecastag@fi.uba.ar>
SEE ALSO
gems-server(1), script(1)
gems AUGUST 2004 GEMS-CLIENT(1)