Symptoms

Unable to access domain's web statistics page at https://www.example.com/plesk-stat/webstat/ : it get redirected to domain main page, or shows error:

404 not found

The following nginx directive is defined in Domains > example.com > Apache and nginx Settings :

if (!-e $request_filename){
    rewrite ^(.*)$ /index.php break;
}

or:

if (!-e $request_filename) {
    rewrite ^/(.*)$ /index.php?q=$1 last;
}

PHP handler is set to FPM by Nginx

Cause

Additional nginx directives interfere with accessing Web Statistics

Resolution

Replace the additional directive with the following:

if (!-e $request_filename ){
        set $test  P;
    }
if ($uri !~ ^/(plesk-stat|webstat|webstat-ssl|ftpstat|anon_ftpstat|awstats-icon)){
        set $test "${test}C";
    }
if ($test = PC){
        rewrite ^ /server/index.php last;
    }

If the directive above fixes the issue with Web Statistics page, but makes some links on a site broken, use the following additional directives instead:

if (!-e $request_filename ){
    set $test  P;
}
if ($uri !~ ^/(plesk-stat|webstat|webstat-ssl|ftpstat|anon_ftpstat|awstats-icon)){
    set $test "${test}C";
}
if ($test = PC){
    rewrite ^/(.*)$ /index.php?q=$1 last;
}

If additional directives are not required for website functioning, remove them in Domains > example.com > Apache and nginx Settings .