The SYS password is not modified during Oracle 12c installation and Web page management cannot log on

Open Https://localhost:5500/em, Login failed with two accounts (Sys;change_on_install) and (System;manager)

Resolved in the following ways:

(1) Enter Sqlplus Sys/change_on_install as SYSDBA on the Windows command line

(2) Modify the SYS account password: ALTER user SYS identified by "New password";

(3) Note that the last semicolon of the second step is not missing

(4) Try again, login successful

The SYS password is not modified during Oracle 12c installation and Web page management cannot log on