MC60 in HTTP used of "AT+QHTTPPOST" receive error: "HTTP DNS error" or "HTTP socket connect error"

Hello
I used to use the HTTP POST & READ at-commands with the MC60 module and everything worked correctly.
But now after sending HTTP POST, MC60 response:

  • CME error: 3813
    or
  • CME error: 3815

In the Quectel document: “Quectel_GSM_HTTP_AT_Commands_Manual_V1.4”
For these errors:
3813 = HTTP DNS error
3815 = HTTP socket connect error

What is “HTTP DNS error” and how do I fix it?
What is “HTTP socket connect error” and how do I fix it?

any help would be appreciated.
Thank you


AT-Command>>>:

AT+QIFGCNT=0
AT+QIFGCNT=0
OK
AT+QICSGP=1,“mcinet”
AT+QICSGP=1,“mcinet”
OK
AT+QIREGAPP=“mcinet”
AT+QIREGAPP=“mcinet”
OK
AT+QIACT
AT+QIACT
OK
AT+QHTTPURL=35,10
AT+QHTTPURL=35,10
CONNECT
https://*******/app/tracker/http

OK
AT+QHTTPPOST=28,20,10
AT+QHTTPPOST=28,20,10
+CME ERROR: 3815
or
+CME ERROR: 3813