The Kraken Cryptocurrency Exchange is back online today, January 13 at 11:30 UTC, after more than 48 hours late.

The exchange was to be disconnected on January 11 at 5 UTC for a two-hour forecast for a system upgrade. As the offline maintenance time was more than two days, Kraken only sporadically updated its status page with promises of progress and an explanation of a bug found in the production environment.

Kraken users were already unhappy with crypto exchange before the upgrade deadline, citing difficulties in placing frequent login exchanges and errors on the site.

The highlight or weak point of the offline hour was the update of Kraken on January 12, 3:46 UTC that they had sent their engineers home to rest instead than to launch immediately.

The update reads:

"We are close but rather than immediately launching ourselves in front of the team that fainted, we are going to push a little to rest and be able to better monitor the systems and react to problems after launch.Unfortunately, it means several hours late. "

With their return online, Kraken has announced that no-debt trading is free until the end of the month on Twitter and on their site. The site has been functioning normally since it went online, but trading was interrupted for several hours due to problems with the display of order book data that has since been resolved.

Earlier this year, Coinbase also went offline for several hours. May be due to degraded performance reported. In addition, several other exchanges, including Luno, Bitfinex and Bitstamp, experienced delays or were disconnected for maintenance in December after an influx of new cryptocurrency users inspired by the rising price of bitcoin (BTC) which has grown exponentially the volume of traffic.

Kraken has not yet responded to Cointelegraph's January 12 request for comment by press time.