The other day, I tried to change my settings of my Aliyun ECS, and found the following:
Mask: 255.255.240.0
Not on purpose, I changed it to 255.255.255.0 without any intension.
Then I cannot do anything through the web...
To filter this rub, I tried the manual on https://help.aliyun.com/knowledge_detail/41470.html?spm=a2c4g.11186631.2.2.JSN7FW
and it is really that helped me with the ping of local IP without response that positions this rub.
Apparently, this is my only mistake that caused this situation. I should have gone through the log to track my attempts and find it earlier.
Well, better late than never.
Cheers!