I am facing annoying problem of only HTTPS websites working on my Mac (in all browsers). I can only visit Google, YouTube, Facebook, Yahoo etc.

So far, I tried following:

  • Websites shows error of: ERR_CONNECTION_REFUSED
  • I have uninstalled Anti-virus
  • Turned off firewall
  • Changed DNS, to, (Google),, (Open DNS),
  • My network is ipv4 supported (but not ipv6) so most websites should work.
  • I tried ping websites that are not opening on browser e.g: dailymotion.com , but I transmitted and received packets without loss. Reinstalled Yosemite but problem still persists.
  • Everything works when I use VPN (e.g hotspot shield), so my guess is DNS is messed up.
  • I tried flushing DNS using sudo killall -HUP mDNSResponder

P.S Everything works in Safe Mode and using mobile hotspot

Here is traceroute, and curl verbose. So the issue is with only http websites.

When I use sudo pfctl -s nat, I am getting following response: “No ALTQ support in kernel ALTQ related functions disabled rdr pass inet proto tcp from (my IP) to any port = 80 -> port 9882”. By removing port forwarding using sudo pfctl -F all, the websites works for few seconds only

Any suggestions please ?


You are probably victim of an adware: OSX/Pirrit. Please read the linked analysis.

To remove the adware save the following shell script as remove-adware.sh (e.g. on your Desktop) and execute it as root:

echo "*** Osx.Pirit Removal script, Amit Serper, @0xamit ***"
echo "*** Before running this script check that you are indeed infected with osx.pirrit. TERMINATE THIS SCRIPT BY HITTING CTRL+C AND RUNNING THE FOLLOWING COMMAND:"
echo "$ dscl . -list /Users UniqueID | grep 401"
echo "If this command has an output then continue running this script. Else DONT"
echo "Press any key to continue running this script, remember - I am not responsible for any unfortunate outcomes"

echo "[*] Getting net_pref name"
netPrefFileName=$(sudo defaults read /Library/Preferences/com.common.plist net_pref)

echo "[*] Netperf name is:"
echo $netPrefFileName

echo "[*] Getting appname from com.common.plist"
appName=$(sudo defaults read /Library/Preferences/com.common.plist name)
echo $appName

echo "[*] Stopping and removing LaunchDaemon"
sudo launchctl unload -w "/Library/LaunchDaemons/"$netPrefFileName
sudo killall $appName

sudo rm "/Library/LaunchDaemons/"$netPrefFileName

echo "[*] Removing injector"
sudo rm -r "/Library/"$appName
echo "[*] Removing malicious pf configs made by Pirrit"
sudo rm /etc/change_net_settings.sh

sudo pfctl -evf /etc/pf.conf

servicePrefFileName=$(sudo defaults read /Library/Preferences/com.common.plist service_pref)
echo “[*] Net pref file name:”
echo $netPrefFileName

appName=$(sudo defaults read /Library/Preferences/com.common.plist name)
echo “[*] App name is:”
echo $appName

echo “[*] Removing LaunchDaemon”
sudo launchctl unload -w "/Library/LaunchDaemons/"$servicePrefFileName
echo [*] Killing app and osascript”
sudo killall $appName
sudo killall osascript

echo “[*] Cleaning up…”
sudo rm "/Library/LaunchDaemons/"$servicePrefFileName

sudo rm -r "/Library/"$appName

echo “[*] Removing pirrit launching script”
sudo rm /etc/run_app.sh

echo “Script finished”

Make it executable:

chmod +x ~/Desktop/remove-adware.sh

change your working directory:

cd ~/Desktop

and execute it. Read the intro of the script thoroughly (especially the advice to run dscl . -list /Users UniqueID | grep 401 before continuing:

sudo ./remove-adware.sh
  • thanks a bunch for the script! It definitely was corrupt pf configs by Pirrit . Here is my terminal logs: pastebin.com/fwVV6Crv – Syed Jun 26 '16 at 10:29
  • @Syed Checking the Terminal output some left-overs of Pirrit may exist. I try to get hands on Pirrit and improve the script (which was just copied from github - check the bottom of the analysis). Do you remember the app/url where you got the adware? – klanomath Jun 26 '16 at 10:34
  • No, I don't think I remember or I had avast earlier installed on my mac, the problem started (http/https) about the time I uninstalled it. – Syed Jun 26 '16 at 10:40
  • @Syed A lot of sites mention MacKeeper as culprit. Did you ever download and install that app? – klanomath Jun 26 '16 at 10:41
  • yes I had MacKeeper installed at some point of time, on a quick search there is a folder in my disk as well. I probably secure trash it. – Syed Jun 26 '16 at 10:44

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