The Signal 503 Service Unavailable is an HTTP response status code that indicates your web server is undoubtedly working properly but couldn’t handle the request. Basically, this happens when the web server is overloaded or going under construction or site maintenance. It is indeed a too annoying problem as you won’t be able to access your WordPress website. Thus, let’s perform the following steps to solve this issue:

•       Reboot your web server.
•       Seriously check for unexpected maintenance.
•       Fix server connectivity issues.