nbr 0: Unknown Error

What it means

Something failed and the bidder cannot say what.

A bidder returns nbr on an otherwise empty BidResponse to say why it is not bidding, instead of (or alongside) an HTTP 204. Code 0 is unknown error.

What to do about it

These codes mean the bidder could not process the request at all. If you are the seller receiving them, first validate the requests you send: a request that fails a bidder's parser produces exactly this family. If you are the bidder emitting them, your own logs, not the exchange's, hold the cause.

Related

• The full nbr code table and how to debug a bidder that stops bidding
• Loss reason codes: the other half of bid feedback
• The validator rule for responses missing both seatbid and nbr