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?
5 Answers
For any system-wide proxy for HTTP, you can check the value of http_proxy
environment variable:
echo "$http_proxy"
For HTTPS:
echo "$https_proxy"
Similarly, there are ftp_proxy
, 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, firefox
, or 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.
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1After I run 'echo "$http_proxy" ' it shows yust one blank row, is that mean that I don't have proxy on my server? Sep 29, 2016 at 17:22
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Attempt an http connection to the outside:
wget http://google.com
You'll see something like this as a result:
--2017-06-12 13:02:53-- http://google.com/
Resolving google.com (google.com)... 172.217.11.142, 2607:f8b0:4002:810::200e
Connecting to google.com (google.com)|172.217.11.142|: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/
In Linux, you can use this to check the proxies defined in the system
env | grep proxy
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2
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
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gedit
might not even be installed, as this could be a server installation.nano
andvim
are both command line text editors. Sep 29, 2016 at 17:41 -
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1Removing everything in
/etc/environment
will break PATH and possibly other configurations. Please don't do that. Sep 29, 2016 at 17:46
# netstat -na
OR, if you think/guess any proxy server then grep it to confirm, e.g.
# netstat -na |grep <ProxyGuess IP>
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these your answer does not tell what to look for exactly in the first half. and it does not answer the central part of the question of "i want to know what it is" because you are assuming something central must already know in order to get the answer. Mar 4, 2022 at 7:46
echo $HTTP_PROXY
do anything?gsettings get org.gnome.system.proxy host
return anything?