I updated to Catalina today and now I cannot connect to my network drive via SMB.

I've tried:

  • using the ip-address, server name
  • the method of creating a nsmb.conf file

Regardless, all I get is an error message stating 'There was a problem connecting to server "name".'

I know the network drive is fine as I can still access the it from my phone and Windows 10.

Any ideas how else I might try to resolve this in macOS?


I ran into the same issue. Some SMB servers use NetBIOS and NetBIOS is disabled by default in MacOS 10.15 (Catalina).

https://medium.com/@gobinathm/how-to-access-smb-printer-shares-in-macos-catalina-10-15-17ea91d2c10b is a blog post that talks about it and lists the following steps to fix it.

By default, Apple has disabled NetBIOS in MacOS 10.5 to speed up SMB operations like mounting, browsing & connecting to an SMB share. If your own an SMB Printer/file server from the Past (i.e., Legacy or OLD) that requires NetBIOS to connect, then these devices won’t connect by default in Catalina like the prior version of MacOS.

In Order access these legacy SMB systems, you need to follow the below steps.

  • Check if your system has/etc/nsmb.conf file. If one does not exist then doing the following. touch /etc/nsmb.conf to create the file.
  • Edit this file in your favorite editor & ensure the following lines are present in the file

Alternative, you can execute the below comments in your terminal.

echo “[default]” | sudo tee -a /etc/nsmb.conf 
echo “port445=both” | sudo tee -a /etc/nsmb.conf

Disable NetBIOS Simple delete the /etc/nsmb.conf

  • I had already tried this method... but didn't work for me. Any other methods? – victoriajpn Oct 10 at 6:19

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