Max retries has been reached, 503!

[pardis]

Hello :

recently I get error due open running following URL :
http://www.dostpersian.com/includes/lib/s.php

Error 503 !

Litespeed log :

2013-01-28 21:08:57.883 [INFO] [37.98.80.132:59378-0#APVH_dostpersian.com] connection to [/tmp/lshttpd/APVH_dostpersian.com_Suphp.sock.631] on request #217, confirmed,
1, associated process: 414945, running: 0, error: Connection reset by peer!
2013-01-28 21:08:57.916 [INFO] [37.98.80.132:59378-0#APVH_dostpersian.com] connection to [/tmp/lshttpd/APVH_dostpersian.com_Suphp.sock.529] on request #217, confirmed,
1, associated process: 414944, running: 0, error: Connection reset by peer!
2013-01-28 21:08:57.949 [INFO] [37.98.80.132:59378-0#APVH_dostpersian.com] connection to [/tmp/lshttpd/APVH_dostpersian.com_Suphp.sock.371] on request #62, confirmed,
1, associated process: 415082, running: 0, error: Connection reset by peer!
2013-01-28 21:08:57.949 [NOTICE] [37.98.80.132:59378-0#APVH_dostpersian.com] Max retries has been reached, 503!
2013-01-28 21:08:57.949 [NOTICE] [37.98.80.132:59378-0#APVH_dostpersian.com] oops! 503 Service Unavailable
2013-01-28 21:08:57.949 [NOTICE] [37.98.80.132:59378-0#APVH_dostpersian.com] Content len: 0, Request line: 'GET /includes/lib/s.php HTTP/1.1'
2013-01-28 21:08:57.949 [NOTICE] [37.98.80.132:59378-0#APVH_dostpersian.com] Content len: 0, Request line: 'GET /includes/lib/s.php HTTP/1.1'

Can you guide to resolve this issue .

Thanks