400 Bad Request This server does not support the operation requested by your client.

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 wrote:

When attempting to change the password (passphrase in Netgear speak), I receive the "400 Bad Request" message found in the subject of this discussion (image below).

 

 

All I did was simply log into the router, click on Wireless (within BASIC tab) and attempt to change the password (image below). It's definitely of length between the requisite 8-63 characters, and I've attempted this multiple times with the same "400 Bad Request" outcome each time.

 

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Sometimes the username/password authentication times out breaking admin website inner controls.  Did you try again starting from http://orbilogin.com?  And if that doesn't work, also try a different browser on your PC/phone.