Recently, I took the risk of buying a few servers on Aliyun's ECS platform, grabs 1 and 2, leading to a series of unexpected events. Since I had already registered my domain on Tencent Cloud, I decided not to integrate it with Aliyun. I relied on my own domain registration and quickly configured FRPS and FRPC, connecting them via TCP. Initially, everything seemed fine, and I was able to access my servers using IPv6. However, all hell broke loose when I decided to access them using IPv4. The TCP connection between FRPS and FRPC was blocked, leading to a series of frustrating and unexpected events. No alerts or warnings were given, and things only returned to normal when I switched back to IPv6. I subsequently took some time to investigate and discovered that the problem was caused by the lack of record-level registration with Aliyun. I decided to submit a video explaining the issue and was eventually granted approval by the end of the next day. To my surprise, a non-registered account under a different name was also able to access the servers without any issues. It appears that as long as the domain is registered with Aliyun, all accounts can access the servers.