Experiencing that a page is just white, without any error displaying, or anything in the errorlog? This is most likely connected to PHP, and not the server. It's commonly called "The White Page of Death" since it's hard to debug without any entries in the errorlog.
Here is what you should try:
- Set a higher memory limit in the Servebolt control panel
- Review and revert the latest changes you have made
- Revert added or removed plugins/modules
- Altered, added or removed PHP code from the site
If that does not work, contact our support and we can help you out.