We're here 24/7 to help!

“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.

The simple issue is that OS X 10.9 and OS X 10.10 included a feature that was incompatible with certain network configurations apparent in most data center and corporate environments. Mac servers running either OS version were having difficulties maintaining a network connection and required constant reboots. We researched the issue and got in touch with both Apple and Cisco, a networking technology company that develops software we use in part of our network. Here’s our post explaining the issue if you want to learn more.

What does that mean for you, today?

If you only rent servers from MacStadium you have nothing to worry about. We apply this fix to all rented 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.

On the other hand, if you’re a current or prospective colocation customer (send your Mac) then your Mac may be susceptible to this issue if it’s running OS X 10.9 or 10.10. Making sure your personal machine is online at all times is a priority for us.

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, login to your account dashboard. Select the Configuration tab, highlighted in the next image.




Select the ARP-Fix link on the sidebar menu.



Verify the IP address of the mini you would like to detect ARP status for. Input your Username and Password.


This will allow us to check whether the ARP-Fix is enabled or needs to be installed. Click Detect.

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


If you receive an error, verify the computer with the chosen IP address is online and that your username and password are correct then try detecting status again.

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, as seen above, click Enable 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 have two options to reboot your server.

  1. Software reboot the Mac as you would normally by logging in through RDP, VNC, Screen Sharing, or SSH.
  2. Navigate to the Power Control tab above and hard-reboot the power outlet your server is plugged into. See below:



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.


We hope this solves any network connectivity issues with your colocated Mac servers running OS X 10.9 and OS X 10.10.