MacOS – Ethernet Working but No Internet Connection

dnsinternetmacosNetwork

In my office, nearly everybody uses Mac and we have just only one Windows 7 system. Just this morning, all the Mac systems (10.8.2) could not connect to the internet but could connect to the network, but the Windows 7 can reach the internet all connected to same switch.

When I tried pinging the DNS address, it replied but I can not ping www.google.com on any of the Macs. If I try creating a new location for the network and enter all the details manually instead of autoConfig, it connects to the internet for like 30 seconds and then shuts off again. The connection still shows green afterall and could still ping the DNS.

I tried killing the mDNSResponder but still same issue.

NB: We don't use any DNS/Mac Servers. We connect to the switch that connects directly to the router.

Best Answer

I had to state the DNS manually and only one of the two DNS was stated and with that, problem solved.

Thanks

Related Solutions

MacOS – DNS resolution broken in El Capitan with Thunderbolt Ethernet Adapter on Offline network

I had the same problem on El Capitan, and was able to resolve it by adding some values to the DNSResponder file, while SIP was DISABLED.

The steps I followed below:

Reboot.
Press Cmd+R to enter Recovery mode.
Open Utilities->Terminal.
Run the command "csrutil disable".
Reboot. You are back in OS X with SIP disabled.
Make the required changes by running the below commands from the terminal:

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

sudo defaults write /Library/Preferences/com.apple.mDNSResponder.plist AlwaysAppendSearchDomains -bool YES (This is a single line)

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

Reboot.
Press Cmd+R to enter Recovery mode.
Open Utilities->Terminal.
Run the command csrutil enable.
Reboot.

After I got back into the OS, I added the search domains back into System Pref -> Network -> Advanced -> DNS Tab.

Search Domains now work once again, where I am able to ping the first two bits of my domain name, and the last 3 are added automatically.

Network – Resolving Host Connection Issues in Terminal/Safari

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.

Best Answer

Related Solutions

MacOS – DNS resolution broken in El Capitan with Thunderbolt Ethernet Adapter on Offline network

Network – Resolving Host Connection Issues in Terminal/Safari

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