Denmark's Maersk, operator of the world's largest container line, said its customers could not use online booking tools and its internal systems were down.
The attack was confirmed to have spread beyond Europe when USA drugmaker Merck, based in New Jersey, said its systems had also been compromised.
The Kremlin says that a ransomware attack that has affected computers across the world highlights the need for close global cooperation in fighting cybercrime.
Sanfield also said Maersk told its trucking companies not to come to the terminal.
AP Moller-Maersk, one of the affected entities globally, operates the Gateway Terminals India (GTI) at JNPT, which has a capacity to handle 1.8 million standard container units.
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Ukraine and Russian Federation appeared hardest hit by Tuesday's violent outbreak of data-scrambling software that locks up computer files with all-but-unbreakable encryption and then demands a ransom for its release.
Other organizations affected include US drugmaker Merck, food and drinks company Mondelez International, global law firm DLA Piper, London-based advertising group WPP.
He said the situation was a first at the Port of Los Angeles.
The strikes follow the global ransomware assault involving the WannaCry virus that affected hundreds of thousands of computers in more than 150 countries, as extortionists demanded US$300 in bitcoin from victims.
Danish shipping mammoth Maersk said Wednesday it had shut down some of its computer systems after a global cyberattack disrupted operations at its terminals and hindered it from taking new orders.
M.K. Sirkar, a manager at the Jawaharlal Nehru Port Trust in Mumbai, said the problem involved a terminal operated by A.P. Moller-Maersk.
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The secretary general of France's main employee union, the CFDT, Laurent Berger, said he's in a "phase of consultation" with the government.
The container terminal was back open and operating in "manual mode" on Wednesday.
"They're utilizing the good old-fashioned way of terminal operations", Adams said.
He added that any response would take time to implement given the large volume of traffic handled by the port. There are now reports of attacks in the US.
Company and government officials reported serious intrusions at the Ukrainian power grid, banks and government offices, where one senior official posted a photo of a darkened computer screen and the words, "the whole network is down". But Tehan said "all indications would point to" it being the same virus. But earlier Wednesday, the Australian Manufacturing Workers' Union's Tasmania secretary John Short said the Cadbury chocolate factory in Tasmania had stopped production after computers there crashed.
The number of companies and agencies reportedly affected by the ransomware campaign was piling up fast, and the electronic rampage appeared to be rapidly snowballing into a real-world crisis. Once paid, a key is entered and the computer's file are allegedly decrypted.
Merck, the second-largest drugmaker in the United States is confirming it's been affected by a cyberattack.
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Its pace appeared to slow as the day wore on, in part because the malware appeared to require direct contact between computer networks, a factor that may have limited its spread in regions with fewer connections to Ukraine.