How do i check to see if my server is running an open proxy?

April 22, 2014 21.2k views
If you have access to the nmap tool, you can check to see if your server is running an open, unsecured HTTP proxy by running the following from a remote location:

sudo nmap -sS -sV -p 8080 --script http-open-proxy.nse X.X.X.X
where X.X.X.X is the IP of your server.


# sudo nmap -sS -sV -p 8080 --script http-open-proxy.nse X.X.X.X

Starting Nmap 6.00 ( ) at 2014-04-22 17:05 UTC

Nmap scan report for (X.X.X.X)

Host is up (0.078s latency).


8080/tcp open http Apache httpd

| http-open-proxy: Potentially OPEN proxy.

|_Methods supported: CONNECTION

If the script returns "Potentially OPEN proxy." you can then check to see if it is a open proxy that does not require authentication with:

http_proxy=http://X.X.X.X:8080/ curl -4 -s

where X.X.X.X is your server's IP address

If you see a message saying "If you are seeing this while running the open proxy text, your server is an open proxy." then you are running an open proxy that anyone in the world can use to connect to any website. This is not a good situation, as it means that cybercriminals and other malicious entities can hide their activities and make it seem like their web connections are originating from your server, and you should secure it right away.If you are running squid, a method of securing your proxy is by using the "acl" feature:

If you are running Apache, this article may help:

If you have any questions, log into the DigitalOcean control panel, click on "Support" and open a support ticket!
1 comment
  • Why in the world can't you techy guys "teach" the steps to take, by SHOWING the user where to go, or better yet, PROVIDE THE LINK, It is unnecessariy and useless to provide "jibberish" codes that mean diddly-squit to 99% of computer users...Do you copy and paste etc...WHAT DO YOU ACTUALLY DO AND WHERE DO YOU GO WITH THIS INFORMATION?
    Please come down to our level and make it easier to understand to be able to follow through on your "suggestions".

4 Answers
This link is also handy:
Hi thanks very much for your response. I can't seem to find Tinyproxy installed anywhere. Could this have been done maliciously?

Do you guys offer support in removing this if this is the case? What would be the charge to remove it for me?

Thanks again
How can we solve this issue?

We'd need to know some more information to help you. What is the output of the command shown above (remember to obscure your IP address)?
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