Someone's set up a proxy on my machine and I want to know what it is. Is there a way to find the proxy server using the command line and not the GUI?
For any system-wide proxy for HTTP, you can check the value of
http_proxy environment variable:
Similarly, there are
socks_proxy for serving the exact purpose of their names. There is also
all_proxy for setting proxy for all these protocols at once. Just to note,
no_proxy unsets proxy for any specific addresses of any (or all) given protocol. Just for sake of completeness, you might want to check the uppercase version of these variables too, although the lowercases are standard for
*_proxy environment variables (only environment variables i am aware of that are lowercased).
Note that, these will show any system-wide proxy setting, not application-specific. For example,
apt can have their own proxy settings irrespective of any global one. Some applications do not honor these variables too (e.g. specific
gnome apps use
gsettings), so YMMV.
Attempt an http connection to the outside:
You'll see something like this as a result:
--2017-06-12 13:02:53-- http://google.com/ Resolving google.com (google.com)... 22.214.171.124, 2607:f8b0:4002:810::200e Connecting to google.com (google.com)|126.96.36.199|:80... connected. HTTP request sent, awaiting response... 302 authenticationrequired Location: http://192.168.254.99:9090/mwg-internal/de5fs23hu73ds/plugin?target=Auth&reason=Auth&ClientID=3130909038&ttl=600&url=aHR0cDovL2dvb2dsZS5jb20v&rnd=1497286973 [following] --2017-06-12 13:02:53-- http://192.168.254.99:9090/mwg-internal/de5fs23hu73ds/plugin?target=Auth&reason=Auth&ClientID=3130909038&ttl=600&url=aHR0cDovL2dvb2dsZS5jb20v&rnd=1497286973 Connecting to 192.168.254.99:9090... connected. HTTP request sent, awaiting response... 401 authenticationrequired
Your proxy server in this case is found after the 302 authentication required. http://192.168.254.99:9090/
check the file :
cat /etc/apt/apt.conf cat /etc/environment
To Modify contents of file (remove everything from apt.conf for no proxy and only proxy sentences from environment)!
sudo nano /etc/apt/apt.conf sudo nano /etc/environment
# netstat -na
OR, if you think/guess any proxy server then grep it to confirm, e.g.
# netstat -na |grep <ProxyGuess IP>
In Linux, you can use this to check the proxies defined in the system
env | grep proxy