Why Oracle 19c Database EM Express Webpage is not opening in Microsoft Edge? I have recently installed Oracle Database 19c on my Laptop which has Windows 10 OS. Now, I want to open the localhost:5500/em page in Microsoft Edge browser, but when I try to do so, the webpage does not open and it says localhost refused to connect.
But in the SQLPLUS command prompt I am able to login successfully and execute queries.
Please help me resolving this issue.
I want to open the localhost:5500/em

What makes you think that the web site is being offered on port 5500?
I don't know about the Express version, but full-blown Enterprise Manager is provided by a running, Middleware process.  Is there a Window Service that you need to start (or, for whatever reason, has failed to start?)

... in the SQLPLUS command prompt I am able to login successfully ...

That's because the Database and the Web Site that you use to manage the Database are two completely separate things.