The networkedmediatank (NMT) forum seems to now be inactive for registration. After accessing a few articles you're asked to register, which doesn't work. I've found a workaround in Firefox:

  1. Press the hamburger
  2. Settings
  3. Privacy and Security
  4. Manage Data
  5. Enter networkmediatank.com
  6. Remove Selected
  7. Save Change, Remove
  8. Keep the page/tab open and continue to browse the forum, when blocked, return to this Setting page/tab. Refresh the page (F5), then return to step 4 , to remove the the stored data again.

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