ISP Problem of Windows Update?

"website (www.microsoft.com) is online but isn't responding to connection attempts." This is the error detected by the troubleshooter. I cannot update my windows 10 whenever I connect to a certain WiFi network or ISP. I've tried ipconfig /renew and /release but it still doesn't work, and other recommendation here in this community but none of those work. Meanwhile I just updated my windows using my data connection. It is clear to me that the problem is not on my machine but it's either on my router or ISP. Do you have any recommendation aside from calling the ISP?