After updating macOS (to 15.0 and later to 15.1), I could not connect to my Synology NAS Surface via the Chrome browser and received the message “This site can’t be reached”. Deleting the macOS DNS cache solved the problem.
My Synology NAS is connected to the same internal network that my Mac is connected to. Unfortunately, after updating macOS, I could no longer access the NAS Surface via Chrome. But access via Safari worked. Strange.
I have surfed the internet and read lots of blog post and found a simple solution: You have to delete the macOS DNS cache, which is then recreated.
More information: How to Use the macOS Flush DNS Command.
Relevant steps at a glance
- Open the Terminal App.
- If you are not logged in as an administrator, change the user in the terminal
#Change to admin and replace <root> by the name of your admin user su - <root>
- Then enter this command:
#Delete DNS cache sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
- Wait a few seconds and open the Chrome browser again. You should now be able to connect to the NAS Surface via Chrome.