Installation won't work

[blacksystem]

I follow the guide to install OTRS 6.0.10
Installation goes fine by SSH, however, whenever I open the web installer it won't make past the Table creation
To be more specific, I insert the MySQL datas, I click check, check passes, I click next and then nothing, stuck here, infinite loading

If I check the MySQL database, I can see it did create the tables, but it won't continue with the web installation.
After some time it returns Gateway timeout (not always, most of the times it just stuck and load infinitely the page).

I tried to just close the web installer and go to index.pl , it does work, but lags extremely and misses all of the configs (mails, admin, etc)

What can I do?
Suggestions?

I am using Centos 7 as OS

[root]

HI,

Did you checked the apache error log?

- Roy

[blacksystem]

HI,

Did you checked the apache error log?

- Roy

Yes, I didn't save the message becaue I reinstalled the VPS a lot of times trying to fix it, but it does say this:
on web page: 504 - Gateway Timeout
on error log: AH01220: Timeout waiting for output from CGI script

Or sometimes it doesn't show any errors and just load indefinitely