How To Fix NAS Connection Failure In macOS Catalina!

One of the issues you may face after upgrading to macOS Catalina is a sudden failure to connect to your NAS. And no matter what you do – you just can’t access your NAS!

Fortunately, we have the solution for this problem. Here is our guide on how you can fix the NAS connection failure in macOS Catalina!


The macOS Catalina NAS Connection Issue

After upgrading to macOS Catalina, you may experience a sudden and persistent inability to connect to your NAS.

When you try to access your NAS, it will say Connection Failed. And nothing happens when you click the Connect As… button – you don’t get the usual security pop-up to log into your NAS.

This is beyond annoying, because you have now lost all access to your NAS on macOS Catalina.

It is definitely a macOS Catalina issue because if you try using a Windows PC or an old macOS system, you will have no issue accessing the same NAS.

So what should you do?


The Cause Of The macOS Catalina NAS Connection Failure

From what we can tell, this issue is happening because Apple apparently dropped support for SMB1 and SMB 2.0 in macOS Catalina.

With many NAS defaulting to SMB1 for compatibility reasons, users will immediately lose the ability to connect once they upgrade to macOS Catalina.


How To Fix The macOS Catalina NAS Connection Failure

The key is to set your NAS to use SMB 3.0 or later. This should not be a problem if your NAS is less than 5-6 years old, because SMB 3.0 was introduced in 2012.

In our guide, we are going to use the screenshots from our Synology NAS. But it should be similar in concept to NAS from other brands like QNAP and WD :

  1. Log into your NAS
  2. Go to Control Panel > File Services.
  3. Under the SMB section, click on Advanced Settings.

  1. In the Advanced Settings pop-up, you will find that the Maximum SMB protocol is probably set to SMB1.
  2. You need to set the Maximum SMB protocol to SMB3.

  1. Now, this is not necessary, but while you are here, you might as well just set the Minimum SMB protocol to SMB2 and Large MTU.
  2. Then click Apply at the bottom of the Advanced Settings pop-up to save the settings.

  1. If it works, you should be able to connect to your NAS after you log out of your NAS. However, in many cases, you need to take an additional step by manually connecting to your NAS.
  2. To do that, you need to select Go > Connect to Server… in Finder.
  3. Then key in smb://ServerName/ (in our example, smb://DiskStation/) and click Connect.
  1. This should finally launch the security login pop-up, where you can key in your Name and Password to log into your NAS.

After logging into your NAS, you should have no issue accessing your NAS. You can also drag and add your NAS folders to the Favourites list in Finder.


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