Hello, I have some problems with fastcgi and caldav. It worked fine before. I think that the last upgrade of php broke something.
Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
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Or for longer, use three backticks above and below the code snippet:
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Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 18.0.2): 18.0.4
Operating system and version (eg, Ubuntu 20.04): Debian 10
Apache or nginx version (eg, Apache 2.4.25): nginx
PHP version (eg, 7.1): 7.3
The issue you are facing:
I cant synchronize my calendar with caldav.
Is this the first time you’ve seen this error? (Y/N): Y
The output of your Apache/nginx/system log in /var/log/____:
2020/05/04 22:45:13 [error] 31364#31364: *4 connect() failed (111: Connection refused) while connecting to upstream, client: 83.157.33.189, server: myserver.fr, request: "POST /apps/text/session/sync HTTP/2.0", upstream: "fastcgi://127.0.0.1:9000", host: "myserver.fr"
2020/05/04 22:45:32 [error] 31364#31364: *55 connect() failed (111: Connection refused) while connecting to upstream, client: 77.204.244.152, server: myserver.fr, request: "PROPFIND /remote.php/dav/files/user/ HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "myserver.fr"
Configuration of nginx :
upstream php-handler {
server 127.0.0.1:9000;
server unix:/var/run/php/php7.3-fpm.sock;
}
server {
#
listen 80;
listen [::]:80;
server_name myserver.fr;
root /var/www;
#affichage de la page par défaut nginx
# location /html/ {
# index index.nginx-debian.html;
# try_files $uri $uri/ =404;
# }
# redirige http vers https
location /nextcloud/ {
return 301 https://$server_name:443$request_uri;
}
}
server {
listen [::]:443 ssl ipv6only=on; # managed by Certbot
listen 443 ssl http2; # managed by Certbot
server_name myserver.fr;
ssl_certificate /etc/letsencrypt/live/myserver.fr/fullchain.pem; # managed by Certbot
ssl_certificate_key /etc/letsencrypt/live/myserver.fr/privkey.pem; # managed by Certbot
include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
# Add headers to serve security related headers
# Before enabling Strict-Transport-Security headers please read into this
# topic first.
add_header Strict-Transport-Security "max-age=15768000; includeSubDomains; → preload;" always;
#
# WARNING: Only add the preload option once you read about
# the consequences in https://hstspreload.org/. This option
# will add the domain to a hardcoded list that is shipped
# in all major browsers and getting removed from this list
# could take several months.
add_header Referrer-Policy "no-referrer" always;
add_header X-Content-Type-Options "nosniff" always;
add_header X-Download-Options "noopen" always;
add_header X-Frame-Options "SAMEORIGIN" always;
add_header X-Permitted-Cross-Domain-Policies "none" always;
add_header X-Robots-Tag "none" always;
add_header X-XSS-Protection "1; mode=block" always;
# Remove X-Powered-By, which is an information leak
fastcgi_hide_header X-Powered-By;
# Path to the root of your installation
root /var/www/nextcloud;
location = /robots.txt {
allow all;
log_not_found off;
access_log off;
}
# The following 2 rules are only needed for the user_webfinger app.
# Uncomment it if you're planning to use this app.
#rewrite ^/.well-known/host-meta /nextcloud/public.php?service=host-meta last;
#rewrite ^/.well-known/host-meta.json /nextcloud/public.php?service=host-meta-json last;
# The following rule is only needed for the Social app.
# Uncomment it if you're planning to use this app.
#rewrite ^/.well-known/webfinger /nextcloud/public.php?service=webfinger last;
#C'est pour caldav et carrdav
location = /.well-known/carddav {
return 301 $scheme://$host:$server_port/remote.php/dav;
}
location = /.well-known/caldav {
return 301 $scheme://$host:$server_port/remote.php/dav;
}
##Pour lest encrypt
location /.well-known/acme-challenge { }
# set max upload size
client_max_body_size 512M;
fastcgi_buffers 64 4K;
#types{
# application/vnd.oasis.opendocument.text;
#}
# Enable gzip but do not remove ETag headers
gzip on;
gzip_vary on;
gzip_comp_level 4;
gzip_min_length 256;
gzip_proxied expired no-cache no-store private no_last_modified no_etag auth;
gzip_types application/atom+xml application/javascript application/jsonapplication/ld+json application/manifest+json application/rss+xml application/vnd.geo+json application/vnd.ms-fontobject application/x-font-ttf application/x-web-app-manifest+json application/xhtml+xml application/xml font/opentype image/bmp image/svg+xml image/x-icon text/cache-manifest text/css text/plain text/vcard text/vnd.rim.location.xloc text/vtt text/x-component text/x-cross-domain-policy;
# Uncomment if your server is build with the ngx_pagespeed module
# This module is currently not supported.
#pagespeed off;
location / {
rewrite ^ /index.php;
}
location ~ ^\/(?:build|tests|config|lib|3rdparty|templates|data)\/ {
deny all;
}
location ~ ^\/(?:\.|autotest|occ|issue|indie|db_|console) {
deny all;
}
location ~ ^\/(?:index|remote|public|cron|core\/ajax\/update|status|ocs\/v[12]|updater\/.+|oc[ms]-provider\/.+)\.php(?:$|\/) {
fastcgi_split_path_info ^(.+?\.php)(\/.*|)$;
set $path_info $fastcgi_path_info;
try_files $fastcgi_script_name =404;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param PATH_INFO $path_info;
fastcgi_param HTTPS on;
# Avoid sending the security headers twice
fastcgi_param modHeadersAvailable true;
# Enable pretty urls
fastcgi_param front_controller_active true;
fastcgi_pass php-handler;
fastcgi_intercept_errors on;
fastcgi_request_buffering off;
}
location ~ ^\/(?:updater|oc[ms]-provider)(?:$|\/) {
try_files $uri/ =404;
index index.php;
}
# Adding the cache control header for js, css and map files
# Make sure it is BELOW the PHP block
location ~ \.(?:css|js|woff2?|svg|gif|map)$ {
try_files $uri /index.php$request_uri;
add_header Cache-Control "public, max-age=15778463";
# Add headers to serve security related headers (It is intended
# to have those duplicated to the ones above)
# Before enabling Strict-Transport-Security headers please read
# into this topic first.
add_header Strict-Transport-Security "max-age=15768000;includeSubDomains; preload;" always;
#
# WARNING: Only add the preload option once you read about
# the consequences in https://hstspreload.org/. This option
# will add the domain to a hardcoded list that is shipped
# in all major browsers and getting removed from this list
# could take several months.
add_header Referrer-Policy "no-referrer" always;
add_header X-Content-Type-Options "nosniff" always;
add_header X-Download-Options "noopen" always;
add_header X-Frame-Options "SAMEORIGIN" always;
add_header X-Permitted-Cross-Domain-Policies "none" always;
add_header X-Robots-Tag "none" always;
add_header X-XSS-Protection "1; mode=block" always;
}
location ~ \.(?:png|html|ttf|ico|jpg|jpeg|bcmap)$ {
try_files $uri /index.php$request_uri;
}
}
Thanks for helping !