Apache stops immediately

[truongductri01]

12:53:56 PM [Apache] Attempting to start Apache app...
12:53:56 PM [Apache] Status change detected: running
12:53:57 PM [Apache] Status change detected: stopped
12:53:57 PM [Apache] Error: Apache shutdown unexpectedly.
12:53:57 PM [Apache] This may be due to a blocked port, missing dependencies,
12:53:57 PM [Apache] improper privileges, a crash, or a shutdown by another method.
12:53:57 PM [Apache] Press the Logs button to view error logs and check
12:53:57 PM [Apache] the Windows Event Viewer for more clues
12:53:57 PM [Apache] If you need more help, copy and post this
12:53:57 PM [Apache] entire log window on the forums

What I should do to fix this? Thank you

[Mariah1902]

I was having the same issue but this reply helped me a lot. I hope you will find your answer from this.
As I am working in a corporate environment where developers faces firewall issues, none of the other answers resolved my issue.
As the port is not used by Skype, but by some other internal applications, I followed the below steps to resolve the issue:
Step 1 - From the XAMPP Control Panel, under Apache, click the Config button, and select the Apache (httpd.conf).
Inside the httpd.conf file, somehow I found a line that says:
Listen 80
And change the 80 into any number / port you want. In my scenario I’m using port 8080.
Listen 8080
Still from the httpd.conf file, I found another line that says:
ServerName localhost:80
Change 80 to 8080.
ServerName localhost:8080
Step 2 - From the XAMPP Control Panel, under Apache, click the Config button again, but this time select the Apache (httpd-ssl.conf). Inside the httpd-ssl.conf file, find line that says
Listen 443
And change the 443 into any number / port you want. I’ll using 4433 as the new port number.
Listen 4433
Still from the httpd-ssl.conf file, find another line that says
<VirtualHost _default_:443>

ServerName localhost:443
And change 443 to 4433.
<VirtualHost _default_:4433>

ServerName localhost:4433
Remember to save the httpd.conf and httpd-ssl.conf files after performing some changes. Then restart the Apache service.