Nginx directive snippet shows no effect

Yesterday I've installed a new server with Nginx based on these instructions. Then I did the installation of Let's Encrypt script. After these steps I created two Nginx directive snippets and added it to the website (I am using https).
For www.mydomain.com/phpmyadmin

Code:

        location /phpmyadmin {
               root /usr/share/;
               index index.php index.html index.htm;
               location ~ ^/phpmyadmin/(.+\.php)$ {
                       try_files $uri =404;
                       root /usr/share/;
                       fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
                       fastcgi_param HTTPS on; # <-- add this line
                       fastcgi_index index.php;
                       fastcgi_param SCRIPT_FILENAME $request_filename;
                       include /etc/nginx/fastcgi_params;
                       fastcgi_param PATH_INFO $fastcgi_script_name;
                       fastcgi_buffer_size 128k;
                       fastcgi_buffers 256 4k;
                       fastcgi_busy_buffers_size 256k;
                       fastcgi_temp_file_write_size 256k;
                       fastcgi_intercept_errors on;
               }
               location ~* ^/phpmyadmin/(.+\.(jpg|jpeg|gif|css|png|js|ico|html|xml|txt))$ {
                       root /usr/share/;
               }
        }
        location /phpMyAdmin {
               rewrite ^/* /phpmyadmin last;
        }

For www.mydomain.com/webmail

Code:

        location /roundcube {
               root /usr/share/;
               index index.php index.html index.htm;
               location ~ ^/roundcube/(.+\.php)$ {
                       try_files $uri =404;
                       root /usr/share/;
                       fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
                       fastcgi_param HTTPS on; # <-- add this line
                       fastcgi_index index.php;
                       fastcgi_param SCRIPT_FILENAME $request_filename;
                       include /etc/nginx/fastcgi_params;
                       fastcgi_param PATH_INFO $fastcgi_script_name;
                       fastcgi_buffer_size 128k;
                       fastcgi_buffers 256 4k;
                       fastcgi_busy_buffers_size 256k;
                       fastcgi_temp_file_write_size 256k;
                       fastcgi_intercept_errors on;
               }
               location ~* ^/roundcube/(.+\.(jpg|jpeg|gif|css|png|js|ico|html|xml|txt))$ {
                       root /usr/share/;
               }
        }
        location /webmail {
               rewrite ^/* /roundcube last;
        }

When I will visit the links www.mydomain.com/phpmyadmin or www.mydomain.com/webmail I get an 404 error. It seems that the snippet has no effect. Has anyone an idea?

Ubuntu 18.04 LTS and ISPConfig 3.1

 

Try disabling this line: # fastcgi_param HTTPS on; # <-- add this line

 

In my opinion no. I have only snippets for phpmyadmin, webmail and gzip. Yes, there is a .err file. It's curious because this file contains the snippets.

I did it but without positive result.

 

I am surprised, it works. I think it was the missing ";" at the end of the gzip snippet.
Thank you for helping!

 

Please don't mind me asking you get that working by fixing ; at the end of gzip snippet - is it without fastcgi_param HTTPS on; disabled?

 

It's disabled.