Terminal/Safari Cannot Resolve Host But Chrome Can Connect

Solution 1:

Your launch daemon com.apple.mDNSResponder.reloaded is not loaded properly.

You can check this by entering sudo launchctl list | grep DNS.

The result should yield something like this:

-   0   com.apple.mDNSResponderHelper.reloaded
108 0   com.apple.mDNSResponder.reloaded

108 is the pid and should differ on your system.

Check your com.apple.mDNSResponder.plist for errors with:

cat /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist

It should look like this:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>com.apple.mDNSResponder.reloaded</string>
    <key>OnDemand</key>
    <false/>
    <key>InitGroups</key>
    <false/>
    <key>UserName</key>
    <string>_mdnsresponder</string>
    <key>GroupName</key>
    <string>_mdnsresponder</string>
    <key>ProgramArguments</key>
    <array>
        <string>/usr/sbin/mDNSResponder</string>
    </array>
    <key>MachServices</key>
    <dict>
        <key>com.apple.mDNSResponder</key>
        <true/>
            <key>com.apple.mDNSResponder.dnsproxy</key>
            <true/>
    </dict>
    <key>Sockets</key>
    <dict>
        <key>Listeners</key>
        <dict>
            <key>SockFamily</key>
            <string>Unix</string>
            <key>SockPathName</key>
            <string>/var/run/mDNSResponder</string>
            <key>SockPathMode</key>
            <integer>438</integer>
        </dict>
    </dict>
    <key>POSIXSpawnType</key>
    <string>Interactive</string>
    <key>EnablePressuredExit</key>
    <false/>
</dict>
</plist>

Remove the lines <key>com.apple.mDNSResponder.reloaded</key> and the immediately following <false/> or <true/> from the file disabled.plist by editing it with

sudo nano /private/var/db/com.apple.xpc.launchd/disabled.plist

You may have to disable SIP to do so!

Remove the mDNSResponder daemon from the launchctl database with:

sudo launchctl remove com.apple.mDNSResponder.reloaded

Re-add it with

sudo launchctl load /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist

Reboot.

Solution 2:

Tried everything and found out it was the LittleSnitch software causing this issue.

Then I opened it and reset the rules via Rules > Restore Factory Defualts…

Oh my.