To address the issues with downloading firmware version 1.11 for the DNS323, several solutions and fixes were proposed:
Yes, but only for legacy use. If you are using the DNS-323 purely as an FTP server, a backup target for rsync, or a music server (DAAP), Firmware 1.11 is rock solid. dns323 firmware 111 download fix
Here is how to bypass the three most common firmware upgrade failures on the DNS-323. Fix 1: Resolving the Browser Compatibility HTTP Block To address the issues with downloading firmware version 1