Here is the sw-cp-server error log:
2014/06/26 06:38:20 [error] 712#0: *180 open() "/opt/psa/admin/htdocs/robots.txt" failed (2: No such file or directory), client: xxx.245.xx.133, server: , request: "GET /robots.txt HTTP/1.1", host: "5.xxnwxx.anxxexxe.net:8880"
2014/06/26 08:27:17 [notice] 27797#0: using inherited sockets from "6;7;8;9;"
2014/06/26 08:40:18 [error] 3409#0: *26 open() "/opt/psa/admin/htdocs/select_components.html" failed (2: No such file or directory), client: xx.185.xx.208, server: , request: "GET /select_components.html HTTP/1.1", host: "panel.pleskexample.de:8443"
2014/06/26 09:23:07 [error] 3409#0: *70 FastCGI sent in stderr: "Primary script unknown" while reading response header from upstream, client: xx.185.xx.208, server: , request: "GET /javascript/promo-flags.js.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/sw-engine.sock:", host: "xxxx.axxsexxe.de:8880", referrer: "http://sxxx.xxdsxxxe.de/"
2014/06/26 10:13:42 [error] 525#0: *36 FastCGI sent in stderr: "Primary script unknown" while reading response header from upstream, client: xxx.126.x.186, server: , request: "GET /javascript/promo-flags.js.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/sw-engine.sock:", host: "urbaxxxxit.de:8880", referrer: "http://urxxnsxxx.de/"
2014/06/26 14:14:35 [error] 525#0: *38 FastCGI sent in stderr: "Primary script unknown" while reading response header from upstream, client: xx.38.xxx.181, server: , request: "GET /javascript/promo-flags.js.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/sw-engine.sock:", host: "urxxxxxxt.de:8880", referrer: "http://uxxaxxx.de/"
2014/06/26 17:54:04 [error] 525#0: *47 FastCGI sent in stderr: "Primary script unknown" while reading response header from upstream, client: xxx.138.xxx.187, server: , request: "GET /javascript/promo-flags.js.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/sw-engine.sock:", host: "urbxxxxixxt.de:8880", referrer: "http://uxxaxxxirit.de/"[/QUOTE]