Apache2 problems after trying install ISPconfig3
I followed this tutorial...here and the previous "install LAMP" tutorial as well, for the ISPconfig i followed till the end, i maybe did small mistake when it was creating the ssl certifcate and asked for my FQDM and i just typed ENTER, now this page: https://server_domain_name:8080 is not opening, either the wordpress admin panel is not opening as well, and i get this message from there:
"Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator at webmaster@localhost to inform them of the time this error occurred, and the actions you performed just before this error.
More information about this error may be available in the server error log.
Apache/2.4.7 (Ubuntu) Server at www...(website)
How could i fix this? Anyone have any idea what could be causing this?