securityGroupArns

Specifies the Amazon EC2 security groups that provide access to your file system's preferred subnet.

The security groups must allow outbound traffic on the following ports (depending on the protocol you use):

• Network File System (NFS): TCP ports 111, 635, and 2049

• Server Message Block (SMB): TCP port 445

Your file system's security groups must also allow inbound traffic on the same ports.