Hello, i have a self hostet invoice ninja on a Ubuntu 22.04.1 LTS VM running on version v5.4.9-C87. I cant log in anymore via the app, because i have a endless loading screen on pc. On my mobilephone i get the message: Socket Exception: Conncetion refused (os Error: Connection refused, erno=111), address = <ip adress) port= 43276. Via the browser i can login normally and do everything in invoice ninja. I hope, u can help me
If you’re using a self signed certificate it may help to use Let’s Encrypt instead.
Hello, sorry for the late answer. I have found the problem, but do not know why, it now occurs at once. i disable ufw and now i cant login from everywhere. I think, i have to configure ufw correct. @david the log was empty since the problem exist. Thank you for the help 
edit:
It helped to enter the following command after configuring the firewall
/var/www/invoiceninja# php artisan optimize