https://wccftech.com/some-users-experiencing-issues-in-file-sharing-after-macos-security-update-heres-how-to-fix-it/

Apple spontaneously released an update for macOS this morning that catered a major security vulnerability. Even though the issue was solved following the update, another issue appeared that distorted file sharing. Apple in its support document today, detailed that some users have been experiencing issues connecting and authenticating when file sharing on their Mac. In addition to this, Apple has also devised a fix for the persisting issue. So let’s dive in to see some more details on the matter.

The issue was not present before as it started to appear after the company rolled out its critical security update. The issue seems to only affect users who have updated their Macs on the macOS High Sierra 10.13.1 firmware. If you’re someone who has run into the issue, Apple has devised a fix for the file sharing issue on the Mac. The fix involves using Terminal so do check it out.