US Military Hit by Computer Network Outage in South Korea

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A field artillery automated tactical data systems specialist operates a computer at 70th Brigade Support Battalion, 210th FA Bde., 2nd ID, during Key Resolve, March 11, 2015 at Camp Casey, South Korea. (U.S. Army/ Sgt. Gun Woo Song)
A field artillery automated tactical data systems specialist operates a computer at 70th Brigade Support Battalion, 210th FA Bde., 2nd ID, during Key Resolve, March 11, 2015 at Camp Casey, South Korea. (U.S. Army/ Sgt. Gun Woo Song)

SEOUL, South Korea -- The U.S. military was hit recently by a computer network outage in South Korea, but the problem has largely been resolved, a spokesman said Wednesday. No cause was given.

The temporary outage occurred in what the military calls Area I and Area II, which includes Seoul and areas close to the border with North Korea.

"Technicians from the 1st Signal Brigade began immediate restorative action and the network is currently at 90 percent," Yongsan Garrison spokesman Wes Hayes told Stars and Stripes. "Due to the sensitive nature of the network and to maintain cyber security, no further information can be provided."

The military communications brigade works to support the ability of U.S. Forces Korea and other commands on the divided peninsula "to lead, direct and maneuver available forces during armistice, crisis or war," Hayes said.

He declined to comment on the cause or provide more information due to security concerns.

A person familiar with the situation, who spoke on condition of anonymity because of the sensitivity of the issue, said the network went down about two weeks ago and was fully offline for about six days before it was mostly restored. The timing could not be confirmed.

The outage comes as fears about the ability of hackers to breach U.S. systems are high.

Last week, National Security Agency official Rob Joyce was quoted as saying that Chinese cyberactivity targeting critical infrastructure in the United States has risen in recent months. The Wall Street Journal also reported Friday that Chinese hackers have breached Navy contractors to steal missile plans and other information.

North Korean hackers also breached the South Korean military’s computer network in 2016, stealing several classified documents, including jointly developed U.S.-South Korean wartime operational plans, officials in Seoul have said.

China and North Korea have denied responsibility for cyberattacks on foreign countries.

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