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Ngninx "cannot load certificate BIO_new_file() failed (SSL: error:0200100D:system library:fopen:Permission", help fix this [emerg] error

mx flag

I am running an Ubuntu 20.04 LEMP server on a Raspberry Pi 4. In my nginx errror logs I am getting the following error:

2023/05/29 11:51:40 [emerg] 3356#3356: cannot load certificate "/etc/letsencrypt/live/postfixadmin.mysite.com/fullchain.pem": BIO_new_file() failed (SSL: error:0200100D:system library:fopen:Permission denied:fopen('/etc/letsencrypt/live/postfixadmin.mysite.com/fullchain.pem','r') error:2006D002:BIO routines:BIO_new_file:system lib)

I'm assuming that this means Nginx is somehow unable to access my certificates. However, my site postfixadmin.mysite.com is still working perfectly. What exactly does this error indicate, and how can I fix this error?

in flag
Off topic, but most probably permissions.
mangohost

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