Part of Microsoft's globe-spanning Windows Azure cloud is having a problem, causing faults for websites and applications based on it.
As of 1:14pm GMT the ajax.aspnetcdn.com Microsoft site was completely unavailable.
Cedexis, a company that operates a variety of cloud monitoring technologies, also confirmed the outage via its Cedexis Radar technology in a post to Twitter at 2:12pm, which showed a loss in capability of the CDN (pictured).
At the time of writing Microsoft had not responded to a ZDNet request for comment. A trawl of the technology giant's public social media accounts showed no acknowledgement of the issue.