A problem of testing security group access in windows10

background ：

Customer side backend services 80,443 Monitored . The customer said that the security team didn't put it away 80,443 But you can telnet through 80 and 443, But browser access is blocked . Security group add 80 and 443 After the direction policy, the browser can access .

analysis ：

Based on this feedback from customers, analyze , I wonder why the security group can be set up without it telnet Well ？？？

test ：

Windows10 Client simulation test ：

It seems that the following results are feasible ：

Colleague sideways ：

It feels like mine Windows10 The version is the feedback like the above , Not successful .

use Linux I measured ：

When the security group is not placed, the port cannot Connected Of .

Conclusion ：

So the current positioning problem is different from the terminal display Windows10 The system is different , There is no problem with the security group mechanism .