Unable to Log In After Patch

Updated: 1 year ago
Article ID: 21687
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Common Problems

You have been disconnected
Error Code: BLZ51901021, BLZ51900001

If you experience problems with World of Warcraft after patching, first check the Realm Status page to see if your realm is currently online. If your realm is online, try the following:

  1. Reset your user interface to make sure your files and addons are not corrupted.
  2. Update or temporarily uninstall any security programs, which may mistakenly identify the login module as a security threat.
  3. Configure firewall and proxy settings for World of Warcraft.
  4. Restart your computer.

Tried everything here?

If you have tried these steps and still require assistance, please visit our Technical Support Forums or contact us.