How to solve error 503 Service Unavailable (Ghost) - ghost-blog

I am running Ghost in development mode on FastComet hosting company. I dont know why but suddenly when i try to access my website I recieve the error
Service Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.
Additionally, a 503 Service Unavailable error was encountered while trying to use an ErrorDocument to handle the request.
If I do ghost restart it says that ghost is turned off, so it’ll turn on and everything comes back to normal. But after some minutes the 503 error comes back.
Does anyone now how can I find out the cause?

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Also from the WordPress form when I submit the form it should call the API but it gives me the 504 gateway timeout error.
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502 Bad gateway while using nginx server

I am following https://github.com/bigchaindb/bigchaindb/blob/v2.0.0b9/docs/server/source/simple-deployment-template/set-up-nginx.md
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I have a Linux server running Nginx and from time to time it starts throwing a 502 error when trying to access it throw HTTP, and after a while gets back to normal.
I've checked the different logs (Nginx, PHP and MySQL) and didn't find anything that could help me find what's causing this.
Any idea where I should look or if it's possible to set any logging/monitorinh tool to help me out?
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502 is a Bad Gateway error. You may want to use a log monitoring tool to see these types of errors. You may also want to send the PHP errors to see if they are generating fatal errors at the same time. I personally use Loggly for this purpose, but you can use other tools available in the market.
Also, I would recommend logging Nginx as JSON, and adding to the normal metrics, the uptime for the upstream servers, so that you can see if the 502 errors are also correlated with deteriorating performance.
If you haven't read this already, I recommend starting here:
https://www.nginx.com/resources/admin-guide/logging-and-monitoring/

Error 500 when goin to wp-admin (Wordpress)

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator at admin#example.com 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/2.4.9 (Win64) PHP/5.5.12 Server at localhost Port 80
As you can see, i can't get into my admin CP. localhost works fine, the trouble comes when i visit localhost/wp-admin. I was trying out this guide, but when it didn't work, i just deleted what i copy pasted. I'm on space bound, and hope here would be a good soul to help me out.
Regards.

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Please contact the server administrator, webmaster#domain.com and
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More information about this error may be available in the server error
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Additionally, a 500 Internal Server Error error was encountered while
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Let me know if you need any other information, i'll do my best to answer them... So you can help me answer mine °-)
UPDATE
I found this in the global server error log:
mod_fcgid: HTTP request length 132480 (so far) exceeds MaxRequestLen (131072)
Your fcgi settings use the default value of MaxRequestLen (131072)
Open apache vhost file and set the value for example to 4MB, aka FcgidMaxRequestLen 4000000.

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