I’ve set up Nginx 1.24.0 on Ubuntu 24.04 LTS, installed PHP 8.3 (PHP 8.3.6), and deployed a fresh Laravel 11.2 project. I created a virtual host on port 82 for telegrambot.test. However, when I try to access http://telegrambot.test:82, I get a 502 Bad Gateway error.
Here's my Nginx config (nginx.conf):
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
# configuration file /etc/nginx/nginx.conf:
user www-data;
worker_processes auto;
pid /run/nginx.pid;
error_log /var/log/nginx/error.log;
include /etc/nginx/modules-enabled/*.conf;
events {
worker_connections 768;
# multi_accept on;
}
http {
##
# Basic Settings
##
sendfile on;
tcp_nopush on;
types_hash_max_size 2048;
# server_tokens off;
server_names_hash_bucket_size 64;
# server_name_in_redirect off;
include /etc/nginx/mime.types;
default_type application/octet-stream;
##
# SSL Settings
##
ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3; # Dropping SSLv3, ref: POODLE
ssl_prefer_server_ciphers on;
##
# Logging Settings
##
access_log /var/log/nginx/access.log;
##
# Gzip Settings
##
gzip on;
# gzip_vary on;
# gzip_proxied any;
# gzip_comp_level 6;
# gzip_buffers 16 8k;
# gzip_http_version 1.1;
# gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
##
# Virtual Host Configs
##
include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;
}
#mail {
# # See sample authentication script at:
# # http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript
#
# # auth_http localhost/auth.php;
# # pop3_capabilities "TOP" "USER";
# # imap_capabilities "IMAP4rev1" "UIDPLUS";
#
# server {
# listen localhost:110;
# protocol pop3;
# proxy on;
# }
#
# server {
# listen localhost:143;
# protocol imap;
# proxy on;
# }
#}
# configuration file /etc/nginx/mime.types:
types {
text/html html htm shtml;
text/css css;
text/xml xml;
image/gif gif;
image/jpeg jpeg jpg;
application/javascript js;
application/atom+xml atom;
application/rss+xml rss;
text/mathml mml;
text/plain txt;
text/vnd.sun.j2me.app-descriptor jad;
text/vnd.wap.wml wml;
text/x-component htc;
image/avif avif;
image/png png;
image/svg+xml svg svgz;
image/tiff tif tiff;
image/vnd.wap.wbmp wbmp;
image/webp webp;
image/x-icon ico;
image/x-jng jng;
image/x-ms-bmp bmp;
font/woff woff;
font/woff2 woff2;
application/java-archive jar war ear;
application/json json;
application/mac-binhex40 hqx;
application/msword doc;
application/pdf pdf;
application/postscript ps eps ai;
application/rtf rtf;
application/vnd.apple.mpegurl m3u8;
application/vnd.google-earth.kml+xml kml;
application/vnd.google-earth.kmz kmz;
application/vnd.ms-excel xls;
application/vnd.ms-fontobject eot;
application/vnd.ms-powerpoint ppt;
application/vnd.oasis.opendocument.graphics odg;
application/vnd.oasis.opendocument.presentation odp;
application/vnd.oasis.opendocument.spreadsheet ods;
application/vnd.oasis.opendocument.text odt;
application/vnd.openxmlformats-officedocument.presentationml.presentation
pptx;
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
xlsx;
application/vnd.openxmlformats-officedocument.wordprocessingml.document
docx;
application/vnd.wap.wmlc wmlc;
application/wasm wasm;
application/x-7z-compressed 7z;
application/x-cocoa cco;
application/x-java-archive-diff jardiff;
application/x-java-jnlp-file jnlp;
application/x-makeself run;
application/x-perl pl pm;
application/x-pilot prc pdb;
application/x-rar-compressed rar;
application/x-redhat-package-manager rpm;
application/x-sea sea;
application/x-shockwave-flash swf;
application/x-stuffit sit;
application/x-tcl tcl tk;
application/x-x509-ca-cert der pem crt;
application/x-xpinstall xpi;
application/xhtml+xml xhtml;
application/xspf+xml xspf;
application/zip zip;
application/octet-stream bin exe dll;
application/octet-stream deb;
application/octet-stream dmg;
application/octet-stream iso img;
application/octet-stream msi msp msm;
audio/midi mid midi kar;
audio/mpeg mp3;
audio/ogg ogg;
audio/x-m4a m4a;
audio/x-realaudio ra;
video/3gpp 3gpp 3gp;
video/mp2t ts;
video/mp4 mp4;
video/mpeg mpeg mpg;
video/ogg ogv;
video/quicktime mov;
video/webm webm;
video/x-flv flv;
video/x-m4v m4v;
video/x-matroska mkv;
video/x-mng mng;
video/x-ms-asf asx asf;
video/x-ms-wmv wmv;
video/x-msvideo avi;
}
# Default server configuration
#
server {
listen 80 default_server;
listen [::]:80 default_server;
# SSL configuration
#
# listen 443 ssl default_server;
# listen [::]:443 ssl default_server;
#
# Note: You should disable gzip for SSL traffic.
# See: https://bugs.debian.org/773332
#
# Read up on ssl_ciphers to ensure a secure configuration.
# See: https://bugs.debian.org/765782
#
# Self signed certs generated by the ssl-cert package
# Don't use them in a production server!
#
# include snippets/snakeoil.conf;
root /var/www/html;
# Add index.php to the list if you are using PHP
index index.html index.htm index.nginx-debian.html index.php;
server_name _;
location / {
# First attempt to serve request as file, then
# as directory, then fall back to displaying a 404.
try_files $uri $uri/ =404;
}
location ~ \.php$ {
try_files $uri =404;
fastcgi_pass unix:/run/php/php-fpm.sock;
fastcgi_index index.php;
include fastcgi.conf;
}
# pass PHP scripts to FastCGI server
#
# location ~ \.php$ {
# include snippets/fastcgi-php.conf;
# # With php-fpm (or other unix sockets):
# fastcgi_pass unix:/run/php/php7.4-fpm.sock;
# # With php-cgi (or other tcp sockets):
# fastcgi_pass 127.0.0.1:9000;
# }
# deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
#location ~ /\.ht {
# deny all;
#}
}
# configuration file /etc/nginx/fastcgi.conf:
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param QUERY_STRING $query_string;
fastcgi_param REQUEST_METHOD $request_method;
fastcgi_param CONTENT_TYPE $content_type;
fastcgi_param CONTENT_LENGTH $content_length;
fastcgi_param SCRIPT_NAME $fastcgi_script_name;
fastcgi_param REQUEST_URI $request_uri;
fastcgi_param DOCUMENT_URI $document_uri;
fastcgi_param DOCUMENT_ROOT $document_root;
fastcgi_param SERVER_PROTOCOL $server_protocol;
fastcgi_param REQUEST_SCHEME $scheme;
fastcgi_param HTTPS $https if_not_empty;
fastcgi_param GATEWAY_INTERFACE CGI/1.1;
fastcgi_param SERVER_SOFTWARE nginx/$nginx_version;
fastcgi_param REMOTE_ADDR $remote_addr;
fastcgi_param REMOTE_PORT $remote_port;
fastcgi_param REMOTE_USER $remote_user;
fastcgi_param SERVER_ADDR $server_addr;
fastcgi_param SERVER_PORT $server_port;
fastcgi_param SERVER_NAME $server_name;
# PHP only, required if PHP was built with --enable-force-cgi-redirect
fastcgi_param REDIRECT_STATUS 200;
# configuration file /etc/nginx/sites-enabled/telegrambot:
server {
listen 82;
listen [::]:82;
server_name telegrambot.test;
root /var/www/telegrambot/public;
add_header X-Frame-Options "SAMEORIGIN";
add_header X-XSS-Protection "1; mode=block";
add_header X-Content-Type-Options "nosniff";
index index.html index.htm index.php index.nginx-debian.html;
location / {
try_files $uri $uri/ /index.php?$query_string;
}
charset utf-8;
location = /favicon.ico { access_log off; log_not_found off; }
location = /robots.txt { access_log off; log_not_found off; }
error_page 404 /index.php;
location ~ \.php$ {
fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $realpath_root$fastcgi_script_name;
include fastcgi_params;
}
location ~ /\.(?!well-known).* {
deny all;
}
}
# configuration file /etc/nginx/fastcgi_params:
fastcgi_param QUERY_STRING $query_string;
fastcgi_param REQUEST_METHOD $request_method;
fastcgi_param CONTENT_TYPE $content_type;
fastcgi_param CONTENT_LENGTH $content_length;
fastcgi_param SCRIPT_NAME $fastcgi_script_name;
fastcgi_param REQUEST_URI $request_uri;
fastcgi_param DOCUMENT_URI $document_uri;
fastcgi_param DOCUMENT_ROOT $document_root;
fastcgi_param SERVER_PROTOCOL $server_protocol;
fastcgi_param REQUEST_SCHEME $scheme;
fastcgi_param HTTPS $https if_not_empty;
fastcgi_param GATEWAY_INTERFACE CGI/1.1;
fastcgi_param SERVER_SOFTWARE nginx/$nginx_version;
fastcgi_param REMOTE_ADDR $remote_addr;
fastcgi_param REMOTE_PORT $remote_port;
fastcgi_param REMOTE_USER $remote_user;
fastcgi_param SERVER_ADDR $server_addr;
fastcgi_param SERVER_PORT $server_port;
fastcgi_param SERVER_NAME $server_name;
# PHP only, required if PHP was built with --enable-force-cgi-redirect
fastcgi_param REDIRECT_STATUS 200;
# configuration file /etc/nginx/sites-enabled/tutorial:
server {
listen 81;
listen [::]:81;
server_name example.ubuntu.com;
root /var/www/tutorial;
index index.html;
location / {
try_files $uri $uri/ =404;
}
}
My /etc/hosts file is configured as follows:
127.0.0.1 localhost
127.0.1.1 Amyr-Linux
127.0.0.1 telegrambot.test
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
I installed a fresh Laravel application under /var/www/telegrambot and set the public folder as the document root. I expected to be able to access the Laravel app by visiting http://telegrambot.test:82, but instead, I got a 502 Bad Gateway error.
My /var/log/nginx/error.log output:
2024/09/24 21:00:35 [error] 58482#58482: *4 open() "/home/amyr/Desktop/Sites/telbot/public/favicon.ico" failed (13: Permission denied), client: 127.0.0.1, server: telegrambot, request: "GET /favicon.ico HTTP/1.1", host: "telegrambot:82", referrer: "http://telegrambot:82/"
2024/09/24 21:00:37 [error] 58485#58485: *5 directory index of "/var/www/telbot/public/" is forbidden, client: 127.0.0.1, server: telbot, request: "GET / HTTP/1.1", host: "127.0.0.1:85"
2024/09/24 21:14:24 [error] 61674#61674: *2 directory index of "/var/www/telbot/public/" is forbidden, client: 127.0.0.1, server: telbot, request: "GET / HTTP/1.1", host: "telbot:85"
2024/09/24 21:20:52 [error] 61673#61673: *3 directory index of "/var/www/telbot/public/" is forbidden, client: 127.0.0.1, server: telbot, request: "GET / HTTP/1.1", host: "telbot:85"
2024/09/24 21:44:11 [error] 71158#71158: *2 directory index of "/var/www/telbot/public/" is forbidden, client: 127.0.0.1, server: telbot, request: "GET / HTTP/1.1", host: "telbot:85"
2024/09/24 22:26:27 [crit] 83369#83369: *3 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "telegrambot.test:81"
2024/09/24 22:29:15 [crit] 84798#84798: *1 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "telegrambot.test:81"
2024/09/24 22:29:19 [crit] 84799#84799: *3 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "telegrambot.test:81"
2024/09/24 22:29:20 [crit] 84801#84801: *5 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "telegrambot.test:81"
2024/09/24 22:29:20 [crit] 84800#84800: *7 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "telegrambot.test:81"
2024/09/24 22:32:35 [crit] 84803#84803: *9 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "telegrambot.test:81"
2024/09/24 22:32:36 [crit] 84804#84804: *11 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "telegrambot.test:81"
2024/09/24 22:33:03 [crit] 84804#84804: *11 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "telegrambot.test:81"
2024/09/24 23:25:47 [crit] 84805#84805: *14 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "telegrambot.test:81"
2024/09/24 23:26:11 [crit] 90146#90146: *1 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "telegrambot.test:81"
2024/09/24 23:27:14 [crit] 90436#90436: *1 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "telegrambot.test:81"
2024/09/24 23:27:40 [crit] 90623#90623: *2 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "telegrambot.test"
2024/09/24 23:35:20 [crit] 93355#93355: *1 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "telegrambot.test"
2024/09/24 23:35:21 [crit] 93356#93356: *3 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "telegrambot.test"
2024/09/24 23:35:58 [crit] 93614#93614: *1 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "telegrambot.test"
2024/09/25 01:01:58 [crit] 107195#107195: *3 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "telegrambot.test"
2024/09/25 01:01:59 [crit] 107196#107196: *5 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "telegrambot.test"
2024/09/25 01:02:33 [crit] 107197#107197: *7 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "telegrambot.test"
2024/09/25 01:02:35 [crit] 107198#107198: *9 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "telegrambot.test"
2024/09/25 01:06:52 [crit] 107199#107199: *11 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "telegrambot.test"
2024/09/25 01:16:07 [crit] 112771#112771: *1 connect() to unix:/var/run/php/php7.4-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php7.4-fpm.sock:", host: "telegrambot.test"
2024/09/25 01:17:09 [crit] 113375#113375: *2 connect() to unix:/var/run/php/php7.4-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php7.4-fpm.sock:", host: "127.0.0.1:82"
2024/09/25 01:17:11 [crit] 113378#113378: *4 connect() to unix:/var/run/php/php7.4-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php7.4-fpm.sock:", host: "127.0.0.1:82"
2024/09/25 01:48:35 [crit] 121423#121423: *1 connect() to unix:/var/run/php/php7.4-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php7.4-fpm.sock:", host: "127.0.0.1:82"
2024/09/25 01:48:37 [crit] 121424#121424: *3 connect() to unix:/var/run/php/php7.4-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php7.4-fpm.sock:", host: "127.0.0.1:82"
2024/09/25 01:57:44 [crit] 121427#121427: *5 connect() to unix:/var/run/php/php7.4-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php7.4-fpm.sock:", host: "127.0.0.1:82"
2024/09/25 02:02:05 [crit] 2658#2658: *1 connect() to unix:/var/run/php/php7.4-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php7.4-fpm.sock:", host: "127.0.0.1:82"
2024/09/25 02:02:35 [crit] 2660#2660: *3 connect() to unix:/var/run/php/php7.4-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php7.4-fpm.sock:", host: "127.0.0.1:82"
2024/09/25 02:02:37 [crit] 2661#2661: *5 connect() to unix:/var/run/php/php7.4-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php7.4-fpm.sock:", host: "127.0.0.1:82"
2024/09/25 02:03:06 [crit] 2659#2659: *7 connect() to unix:/var/run/php/php7.4-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php7.4-fpm.sock:", host: "telegrambot.test:82"
2024/09/25 11:20:33 [crit] 2854#2854: *4 connect() to unix:/var/run/php/php7.4-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: telegrambot.test, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php7.4-fpm.sock:", host: "telegrambot.test:82"
After reviewing my configuration, I noticed that the fastcgi_pass directive in my Nginx configuration is pointing to the PHP 7.4 FPM socket, while I am using PHP 8.3. I think this might be the root cause of the issue.
I ran the following command to check for the correct PHP 8.3 FPM socket:
sudo find /var/run/php/ -name "php8.3-fpm.sock"
Based on the result, I updated my Nginx configuration to:
fastcgi_pass unix:/var/run/php/php8.3-fpm.sock;
However, the problem persists, and I am still getting the 502 Bad Gateway error. I also confirmed that both the Nginx and PHP-FPM services are running correctly.
I've tried a simple php script (phpinfo()) and it works perfect
I'm expecting Laravel to load properly when I access http://telegrambot.test:82, but instead, I keep getting this gateway error. Any suggestions on what else I should check or configure?
Based on the nginx.conf and the virtual host config for telegram.bot, it appears that the fastcgi_pass is still pointing to PHP 7.4 FPM socket.
update the fastcgi_pass directive to :
fastcgi_pass unix:/var/run/php/php8.3-fpm.sock;
check nginx configuration
sudo nginx -t
restart nginx and PHP-FPM
sudo systemctl restart nginx
sudo systemctl restart php8.3-fpm
verfiy permissions: ensure nginx user (www-data) has necessary permission to access the files in the dir /var/wwww/telegrambot/public dir
sudo chown -R www-data:www-data /var/www/telegrambot
sudo chmod -R 755 /var/www/telegrambot
check logs for any additional errors.