Google's DoubleClick advertising platform for publishers is now displaying ads again having gone offline for over an hour, leaving millions of websites worldwide unable to display adverts.
The downtime meant that sections of websites that usually host adverts instead just displayed white space. This could have cost companies millions by affecting the delivery of advertising targets, and hit Google's advertising revenue as well.
The problem with the DoubleClick for Publishers (DFP) platform also slowed websites by making pages take far longer than normal to load. The team acknowledged the incident on its Twitter page.
We're experiencing some issues with DoubleClick for Publishers. The team is working on it and we'll keep you posted.— DoubleClickPublisher (@doubleclick_pub) November 12, 2014
After the incident was fixed Google released a statement confirming that the outage affected the entire DoubleClick for Publishers system, which is now back up and running.
"DoubleClick for Publishers experienced an outage this morning impacting publishers globally, across their video, display, native and mobile formats," the firm said.
"Our team has worked quickly to fix the software bug and DFP is now back up and running, so our publisher partners can return to funding their content."
The specifics of the 'software bug' that caused the downtime remain unclear, however.
The incident will have affected millions of websites across the world that use Google's platform to display ads, which could have cost them thousands or millions of dollars, as they rely on delivering hits to serve ads.
Google then splits the revenue this generates between itself and the web publishers.
Google's own YouTube was also affected and was unable to display thumbnails of videos (shown below) or displayed a 502 error message when it attempted to retrieve an advert from the server.
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