I am using the wiznet W7500S2E-R1 module. I found an extreme case in wiznet, when module is been powered on after a long gap (let say 1 day), factory reset and try to connect with DNS enabled at the first attempt to make a connection, the connection will be unsuccessful.
After factory reset, I input the following AT commands,
After AT+EXIT, i expect the module attempt to connect to the domain - mi-office.com, which is not happening. I attached the screenshot & Wireshark log here.
But, later when i reset the module and again going to data mode is making a successful connection. Attached the screenshot & Wireshark log here.
Also whenever I try to use the DNS feature (AT+DNSEN=1), more often the connections are failing. Whereas when I connect the IP without using DNS enabled, I never get a failure in connections.