By Eva Dou 

BEIJING--The U.S. Navy is looking at dropping IBM servers from some weapons systems after the server line was purchased by China's Lenovo Group Ltd., highlighting how security considerations are affecting technology sales in both countries.

The U.S. Department of Homeland Security identified security concerns with the IBM unit sale and placed restrictions on federal government procurement of Lenovo BladeCenter servers, a Navy spokesman said.

Lockheed Martin Corp., the world's largest defense contractor by sales and the supplier of the Aegis Combat System, said it is discussing the issue with the Navy. In response to a question about the inclusion of IBM servers in the Aegis Combat System, Keith Little, a spokesman for Lockheed Martin, said, "I can confirm that we are working with the U.S. Navy to ultimately select an appropriate course of action."

Lenovo spokesman Ray Gorman said the company doesn't comment on customer contracts, but that Lenovo continues to sell servers and other products to the U.S. government. Lenovo acquired IBM's lower-end x86 server business last year for $2.1 billion.

"We value our productive relationship with the U.S. government and will work together cooperatively to address the concerns or issues any individual agency may have," said Mr. Gorman in a statement.

A Department of Homeland Security spokesman declined to comment, saying the topic fell under the Treasury Department.

The Aegis Combat System helps U.S. ships attack targets as well as track and defend against enemy missiles and aircraft. The U.S. Naval Institute's online news portal, USNI, earlier this month said the Navy would replace the IBM servers in the Aegis system. It wasn't clear how big that business is.

Both the U.S. and China are wary of purchasing foreign technology for use in sensitive sectors due to spying concerns. Gartner technology analyst Errol Rasit said the trend has accelerated.

"There has been a shift recently for geopolitical reasons to bias sourcing decisions to local organizations," said Mr. Rasit. "Whether that be Chinese technology providers in China, or North American providers in North America, there is absolutely a shift there. It may affect the market opportunity for some of these vendors."

Lenovo, the world's largest PC maker by shipments, has presented itself as a nonpolitical, multinational company. It also has headquarters in Morrisville, N.C., and has promoted western executives to senior positions.

Lenovo is scheduled to announce on Thursday its earnings for its fiscal fourth quarter ended in March. The company is expected to post net profit of $111.3 million, down 30% from a year earlier, according to a Thomson Reuters average forecast. Revenue is expected to rise nearly 29% to $12 billion, boosted by acquisitions.

Analysts expect security concerns over Lenovo's takeover of the IBM server line to hit sales in the U.S., although it will be partly offset by gains in server sales in China. A slowdown in the China smartphone market and weak global PC demand are other factors. Lenovo last week said it would lay off 235 U.S.-based employees from its enterprise business as part of a usual adjustment following the acquisition.

In the U.S., China's Huawei Technologies Co. has been effectively shut out of the U.S. telecommunications equipment market after a 2012 congressional report that said Beijing could use the company's gear for spying. After Lenovo acquired IBM's PC business in 2005, the State Department banned use of the PCs on its classified networks in the U.S. and abroad, The Wall Street Journal reported last year citing current and former officials.

In China, Beijing accelerated its shift to Chinese technology after former U.S. defense contractor Edward Snowden alleged in 2013 that the U.S. government used infrastructure belonging to U.S. tech firms for spying. China's banking regulator issued strict guidelines to banks' technology purchases that required suppliers to hand over proprietary information, but suspended the rules last month after strong protest from the U.S. government.

Lenovo's purchase of the IBM server unit was delayed last year by a review by the Committee on Foreign Investment in the U.S., a panel that screens deals that could have national-security implications. A U.S. Treasury spokeswoman declined to comment on whether restrictions have been placed on federal government procurement of Lenovo or IBM servers, saying that information filed with the committee couldn't be publicly disclosed by law.

Lenovo said when the deal closed at the end of September that it would continue to use the IBM brand on the servers for about a year and that it hadn't made branding decisions beyond that.

For Lenovo, the security concerns are compounded by a tepid global enterprise market. Global spending on servers will contract 2% this year, Mr. Rasit said.

Write to Eva Dou at eva.dou@wsj.com

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