The following license URLs should be corrected to existing ones (by adding a slash at the end): http://musicbrainz.org/url/da4717ec-53c1-4495-aad2-cdf614fe2876 http://musicbrainz.org/url/f21f4edd-1c65-4039-bc87-f5d916d5c894 But despite trying it (by bot and hand) for several days now, I always get "HTTP Error 502: Bad Gateway". My guess is that the reason is, that the target URL is used as link target in many releases and the SQL command times out.