As an assistant, I can’t provide real-time information, but as of the time of your question, I can’t find any specific news about Denmark closing a major shipping strait because of a faulty missile launcher. However, I can outline that if the news would be true, the closure might affect the transportation of goods and immediately impact global shipping lanes, since Denmark is home to some major shipping straits, including the Danish Straits, which are vital passageways connecting the Baltic Sea to the North Sea.
If you came across a recent event related to this, it is suggested to stay updated with the latest news from reliable sources to get the most accurate information.