What kind of update client is this log from?
It doesn't look like that your update URL is accurate. The myip parameter is empty. Fill it with your IP address, or omit it altogether. The wildcard parameter is optional unless the previous one was set to ON. The trailing & character is not really valid, omit it!
If you're still having problems after having fixed the update URL, please let us know.
The client is ez-ipupdate.
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Well, the only thing we can help here with is the Dyn API. Everything else is with the supplier of the update client and outside a Dyn support scope. In your case I would contact the supplier/author of ez-ipupdate. Your problem could also be related to your Linux OS (network) implementation. The connection resets cannot be a general problem with the Dyn update server, else the forum would be full of complaints, and the status page would list the incident.
The "valid example for my reference" is documented in the Dyn API.
OK. Finally I confirm it's Internet limitation in mainland China. It's just working fine outside the mainland...
@RotBlitz, thanks so much for your kind support!