A Google Webmasters Help thread has reports that the Google Webmaster Tools API is having some technical difficulties over the weekend.
Users of the API are receiving 502 errors for some requests. Authentication seems to work via the API, but all other requests seem to time out eventually. One webmaster coder said the following protocols are having issues, but there may be others:
- https://www.google.com/webmasters/tools/feeds/sites/
- https://www.google.com/webmasters/tools/feeds/keywords/
- https://www.google.com/webmasters/tools/feeds/siteID/sitemaps/
- https://www.google.com/webmasters/tools/feeds/messages/
- https://www.google.com/webmasters/tools/feeds/siteID/crawlissues/
Googler, JohnMu, said he has "passed it on to the team to take a look."
Forum discussion at Google Webmasters Help.

Comments:
Anton Malinovskiy
07/20/2009 03:39 pm
for me it just returns the empty list for e.g. sites feed
Vijaya Kumar S
12/01/2009 06:07 am
While i trying to access above protocols(Google Webmaster Tools API), i facing Error 401(Authorization required). Any answers for this?