Is it permissible for parents to forbid their son from marrying someone of another nationality?I run an online institute and a female teacher from another country applied. I requested her wali’s contact for marriage,but my parents said if I marry outside our nationality,they will cut off connection.

What is best for you to do is to make dua, pray Istikhara, and ask Allah Subhanahu wa ta'ala to ease their hearts. If she is good for you, ask that Allah Subhanahu wa ta'ala make them see the truth and aid you in your endeavor. You should also say kind words to them and try to convince them with goodness. Use wisdom in the uttermost sense that you are capable of, and be very patient so that they accept. This is the best thing for you, rather than going off and marrying her and getting into family problems from the beginning. So the best thing for you to do is try to convince them with good and kind words. Always use wisdom in these situations.