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How to Apply the ARP-Fix for Colocated Macs

ARP Fix Status

"Why do I have constant issues connecting to my colocated Mac running OS X?" 

This question doesn't come up often, but it’s worth sharing the most likely answer and how to fix the issue permanently. 

If you’ve been with MacStadium for a while or have ever used a Mac behind multiple network gateways in the past, you are likely aware of the networking issue present in previous versions of Apple’s OS X operating system. 

What does that mean for you, today?

If you only subscribe to servers from MacStadium you have nothing to worry about. We apply this fix to all of our Mac computers as part of our deployment process. It’s completely automated and we’ve done it with thousands of servers in the past year and will continue to do so with installs of OS X 10.9 and 10.10 into the foreseeable future. 

We’ve created a simple tool in our account dashboard for you to detect whether the fix is enabled, enable it, or disable it. See below for the steps.

How to Enable the ARP-Fix from the Account Dashboard

Step 1: Log into the MacStadium portal

Account Dashboard

Step 2: Select one of the colocated Macs that you would like to check the ARP fix status of, or if you would like to enable or disable the ARP fix on.

Colocated Mac Dashboard

Step 3: Click on the "ARP Fix" tab for the selected Mac.

ARP Fix tab

From here you can check if the ARP fix has yet been applied to the colocated Mac, or enable and disable it.

Step 4: Verify the IP address of the Mac you would like to detect the ARP status for and input your username and password.

Check ARP FIx Status Screen

This will allow us to check whether the ARP fix is enabled or needs to be installed.

Step 5: Click Check Status. 

You’ll receive a response with the current OS X version and the ARP-Fix status.

If the status is Enabled, you’ve got nothing else to worry about. Please open a support ticket if you are still having network connectivity issues. 

If the status is Disabled, please click the Enable button to apply the ARP-Fix. After a few seconds you will receive a response that it was successful and that your server requires a reboot. 

You can do a software reboot by logging into the Mac as you would normally through RDP, VNC, Screen Sharing, or SSH. 

An alternative to that is to do it directly from the dashboard you're already looking at. Navigate to the Actions button on the right for the selected Mac and click Hard-Reboot in order to hard reboot the power outlet your server is plugged into. See below:

Reboot server

After waiting 30-60 seconds for your server to come back online fully, navigate back to the ARP-Fix page and detect ARP-Fix status once more. You’ll receive a status of Enabled and then you’re done.



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