Guangzhou-based video sharing site 56.com, one of China’s triumvirate of “YouTube clones,” has been temporarily shut down by the Guangdong provincial branch of the State Administration of Radio, Film, and Television (SARFT), acting on orders from SARFT’s national leadership, according to a highly-placed industry insider who declined to be named. The closure seems to have been in effect since 6pm on June 3.

The site’s IP address had been replaced with a non-routeable IP address, effectively preventing access to the site. The shut down — the second to impact a top-tier video sharing site — was in discussion for a few weeks, the insider said, and the timing of the outage “probably has nothing to do with” the anniversary of the suppression of the student uprising of 19 years ago. 56.com rival Tudou was shuttered for 24 hours from midnight on March 14 earlier this year. There has been no indication as to when 56.com’s service will return to normal.

A Tencent news story reprinted on Hexun.com here cites an explanation issued by 56.com at 10am this morning saying that the site experienced server malfunctions that are currently being addressed. Tudou had similarly announced that it was moving servers, though the company’s appearance at the top of a “black list” issued by SARFT led many to assume the company was being punished for failing to filter content to the satisfaction of regulators. 56.com’s name has not appeared on any of the black lists thus far issued by SARFT.

“A server going down wouldn’t explain a non-routable private IP address in the DNS record,” said Andrew Lih, author of the forthcoming book The Wikipedia Revoluion, casting doubt on the company’s explanation.

Richard Wang, deputy general manager of Neo@Ogilvy, OgilvyOne’s media planning and buying arm, says that Neo has bought small volumes of advertising with 56.com on behalf of clients but was not given any warning that a temporary shut-down of the site was in store, and was surprised to learn that the site had been shuttered.