If the connection to your proxy port was suddenly interrupted, most likely you exhausted the maximum allocated traffic. Your port may remain in the ‘Active ports’ tab if it have not reached the expiration date yet, but you will need to renew it in the triple-dots menu if you want to continue using it.
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If you are unsure whether your have exhausted the traffic for a certain port, feel free to contact Gsocks support regarding the matter, and we will be glad to check it for you.