If you guys are getting coupon expired or course is not free after opening the link, then it is due to the fact that course instructors provide only few hundreds or thousands of slots which get exhausted. So, try to enroll in the course as soon as it is posted in the channel. The Coupons may expire any time for instant notification follow telegram channel
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Contact your hosting provider letting them know your web server is not completing requests. An Error 522 means that the request was able to connect to your web server, but that the request didn’t finish. The most likely cause is that something on your server is hogging resources. Additional troubleshooting information here.