ERROR 500 - Internal Server Error! - Joomla! Forum - community, help and support

two joomla 3 sites have error 500 - internal server error!

logs show
[tue aug 02 15:31:27 2016] [warn] [client 192.168.1.253]
(104) connection reset peer: mod_fcgid: error reading data fastcgi server
[tue aug 02 15:31:27 2016] [error] [client 192.168.1.253]
premature end of script headers: index.php

php = fast-cgi

any appreciated

problem description :: forum post assistant (v1.2.7) : 3rd august 2016 wrote:blank page

log/error message :: forum post assistant (v1.2.7) : 3rd august 2016 wrote:[wed aug 03 00:18:08 2016] [error] [client 192.168.1.253] premature end of script headers: index.php [wed aug 03 00:20:36 2016] [warn] [client 192.168.1.253] (104)connection reset peer: mod_fcgid: error reading data fastcgi server

log/error message :: forum post assistant (v1.2.7) : 3rd august 2016 wrote:[wed aug 03 00:18:08 2016] [error] [client 192.168.1.253] premature end of script headers: index.php [wed aug 03 00:20:36 2016] [warn] [client 192.168.1.253] (104)connection reset peer: mod_fcgid: error reading data fastcgi server

forum post assistant (v1.2.7) : 3rd august 2016 wrote:

basic environment :: wrote:joomla! instance :: joomla! 3.4.8-stable (ember) 24-december-2015
joomla! platform :: joomla platform 13.1.0-stable (curiosity) 24-apr-2013
joomla! configured :: yes | read-only (444) | owner: web12 (uid: 1/gid: 1) | group: client6 (gid: 1) | valid for: 1.5
configuration options :: offline: 0 | sef: 1 | sef suffix: 1 | sef rewrite: 1 | .htaccess/web.config: yes | gzip: 1 | cache: 2 | ftp layer: 0 | ssl: 0 | error reporting: e_all | site debug: 0 | language debug: 0 | default access: n/a | unicode slugs: n/a | database credentials present: yes

host configuration :: os: linux | os version: 3.2.0-4-amd64 | technology: x86_64 | web server: private | encoding: gzip, deflate | doc root: /var/www/atlantic39.com/web | system tmp writable: yes

php configuration :: version: 5.4.45-0+deb7u4 | php api: cgi-fcgi | session path writable: yes | display errors: 1 | error reporting: 32759 | log errors to: | last known error: | register globals: | magic quotes: | safe mode: | open base: /var/www/clients/client6/web12/web:/var/www/clients/client6/web12/private:/var/www/clients/client6/web12/tmp:/var/www/atlantic39.com/web:/srv/www/atlantic39.com/web:/usr/share/php5:/usr/share/php:/tmp:/usr/share/phpmyadmin:/etc/phpmyadmin:/var/lib/phpmyadmin:/usr/share/php | uploads: 1 | max. upload size: 250m | max. post size: 1g | max. input time: 60 | max. execution time: 300 | memory limit: 512m

mysql configuration :: version: 5.5.49-0+deb7u1-log (client:5.5.49) | host: --protected-- (--protected--) | collation: latin1_swedish_ci (character set: latin1) | database size: 3.41 mib | #of tables:  91

detailed environment :: wrote:php extensions :: core (5.4.45-0+deb7u4) | date (5.4.45-0+deb7u4) | ereg () | libxml () | openssl () | pcre () | zlib (2.0) | bcmath () | bz2 () | calendar () | ctype () | dba () | dom (20031129) | hash (1.0) | fileinfo (1.0.5) | filter (0.11.0) | ftp () | gettext () | spl (0.2) | iconv () | json (1.2.1) | mbstring () | pcntl () | apc (3.1.13) | posix () | reflection ($id: f6367cdb4e3f392af4a6d441a6641de87c2e50c4 $) | session () | shmop () | simplexml (0.1) | soap () | sockets () | standard (5.4.45-0+deb7u4) | exif (1.4 $id: 05041c5f0094cb46d9b516bd624d593b90cc38f9 $) | sysvmsg () | sysvsem () | sysvshm () | tokenizer (0.1) | wddx () | xml () | xmlreader (0.1) | xmlwriter (0.1) | zip (1.11.0) | cgi-fcgi () | pdo (1.0.4dev) | phar (2.0.1) | curl () | gd () | geoip (1.0.7) | imap () | intl (1.1.0) | ldap () | mcrypt () | memcached (2.0.1) | mysql (1.0) | mysqli (0.1) | pdo_mysql (1.0.2) | pdo_sqlite (1.0.1) | pspell () | recode () | snmp (0.1) | sqlite3 (0.7) | tidy (2.0) | xmlrpc (0.51) | xsl (0.1) | imagick (3.1.0rc1) | ming () | ps (1.3.7) | sasl () | ssh2 (0.11.3) | mhash () | ioncube loader () | zend engine (2.4.0) |
potential missing extensions :: suhosin |

switch user environment (experimental) :: php cgi: yes | server su: yes | php su: yes | custom su (litespeed/cloud/grid): yes
potential ownership issues: no

folder permissions :: wrote:core folders :: images/ (755) | components/ (755) | modules/ (755) | plugins/ (755) | language/ (755) | templates/ (755) | cache/ (755) | logs/ (755) | tmp/ (755) | administrator/components/ (755) | administrator/modules/ (755) | administrator/language/ (755) | administrator/templates/ (755) |

elevated permissions (first 10) :: jaextmanager_data/ (777) |

extensions discovered :: wrote:components :: site :: com_mailto (3.0.0) | com_wrapper (3.0.0) |
components :: admin :: com_messages (3.0.0) | com_weblinks (3.0.0) | com_contenthistory (3.2.0) | com_admin (3.0.0) | com_plugins (3.0.0) | com_jaextmanager (2.5.8) | com_jaextmanager (2.5.3) | com_joomlaupdate (3.0.0) | com_newsfeeds (3.0.0) | com_tags (3.1.0) | com_checkin (3.0.0) | com_postinstall (3.2.0) | com_login (3.0.0) | com_cpanel (3.0.0) | com_redirect (3.0.0) | com_ajax (3.2.0) | com_cache (3.0.0) | com_config (3.0.0) | com_banners (3.0.0) | com_menus (3.0.0) | com_languages (3.0.0) | com_content (3.0.0) | com_categories (3.0.0) | com_search (3.0.0) | com_media (3.0.0) | com_templates (3.0.0) | com_users (3.0.0) | com_installer (3.0.0) | breezingforms (1.8.1 stable ) | unknown (-) | unknown (-) | com_modules (3.0.0) | com_finder (3.0.0) | com_contactenhanced (3.0.4) |

modules :: site :: mod_login (3.0.0) | mod_random_image (3.0.0) | google simple route 1.7.0 (1.7.0) | mod_footer (3.0.0) | mod_languages (3.0.0) | multitrans (7.3) | contact enhanced slideshow (3.0.0) | mod_breadcrumbs (3.0.0) | mod_tags_popular (3.1.0) | mod_finder (3.0.0) | mod_menu (3.0.0) | mod_ce_category (3.0.0) | breezingforms (1.8) | date2 (2.3.39b) | ja slideshow (2.5.8) | contact enhanced form (3.0.0) | mod_wrapper (3.0.0) | mod_syndicate (3.0.0) | mod_stats (3.0.0) | mod_users_latest (3.0.0) | date hour (1.0) | mod_search (3.0.0) | mod_tags_similar (3.1.0) | mod_articles_category (3.0.0) | mod_articles_categories (3.0.0) | contact enhanced search (3.0.0) | mod_articles_news (3.0.0) | mod_feed (3.0.0) | mod_articles_archive (3.0.0) | mod_banners (3.0.0) | mod_custom (3.0.0) | mod_articles_latest (3.0.0) | mod_articles_popular (3.0.0) | mod_weblinks (3.0.0) | mod_related_items (3.0.0) | mod_whosonline (3.0.0) |
modules :: admin :: mod_login (3.0.0) | mod_submenu (3.0.0) | mod_quickicon (3.0.0) | mod_menu (3.0.0) | mod_multilangstatus (3.0.0) | mod_title (3.0.0) | mod_latest (3.0.0) | mod_status (3.0.0) | mod_stats_admin (3.0.0) | mod_popular (3.0.0) | mod_feed (3.0.0) | mod_custom (3.0.0) | mod_toolbar (3.0.0) | mod_version (3.0.0) | mod_logged (3.0.0) |

plugins :: site :: plg_user_ce_contactcreator (3.0.0) | plg_user_joomla (3.0.0) | plg_user_profile (3.0.0) | plg_user_contactcreator (3.0.0) | plg_authentication_joomla (3.0.0) | plg_authentication_ldap (3.0.0) | plg_authentication_cookie (3.0.0) | plg_authentication_gmail (3.0.0) | plg_system_languagefilter (3.0.0) | plg_system_log (3.0.0) | system - ce feedback (3.0.1) | plg_system_debug (3.0.0) | plg_system_logout (3.0.0) | system - nice google analytics (1.01) | plg_system_p3p (3.0.0) | system - isekeywords (3.0.0) | system - mail links contact (3.0.1) | plg_system_languagecode (3.0.0) | plg_system_cache (3.0.0) | plg_system_redirect (3.0.0) | ja t3 framework (2.7.0) | plg_system_remember (3.0.0) | plg_system_sef (3.0.0) | plg_system_highlight (3.0.0) | system - icaptcha (3.0.0) | plg_extension_joomla (3.0.0) | plg_editors_codemirror (5.6) | plg_editors_tinymce (4.1.7) | plg_search_newsfeeds (3.0.0) | plg_search_tags (3.0.0) | plg_search_weblinks (3.0.0) | plg_search_contactenhanced (3.0.0) | plg_search_contacts (3.0.0) | plg_search_categories (3.0.0) | plg_search_content (3.0.0) | plg_twofactorauth_yubikey (3.2.0) | plg_twofactorauth_totp (3.2.0) | plg_finder_newsfeeds (3.0.0) | plg_finder_tags (3.0.0) | plg_finder_weblinks (3.0.0) | plg_finder_contacts (3.0.0) | plg_finder_categories (3.0.0) | plg_finder_content (3.0.0) | plg_editors-xtd_readmore (3.0.0) | plg_editors-xtd_image (3.0.0) | plg_editors-xtd_pagebreak (3.0.0) | button - contact enhanced form (3.0.1) | plg_editors-xtd_article (3.0.0) | plg_captcha_recaptcha (3.4.0) | plg_content_joomla (3.0.0) | plg_content_pagenavigation (3.0.0) | plg_content_pagebreak (3.0.0) | content - contact enhanced (3.0.1) | plg_content_vote (3.0.0) | plg_content_finder (3.0.0) | plg_content_emailcloak (3.0.0) | breezingforms (1.8) | plg_content_geshi (3.0.0) | plg_content_loadmodule (3.0.0) | plg_quickicon_joomlaupdate (3.0.0) | plg_quickicon_extensionupdate (3.0.0) |

templates discovered :: wrote:templates :: site :: beez3 (3.1.0) | ja_edenite (2.5.3) | protostar (1.0) |
templates :: admin :: hathor (3.0.0) | isis (1.0) |

i'd inclined contact hosting provider see if they've changed/ updated end.

with previous host using, had add line of code .htaccess file fastcgi work properly.

i'd try temporarily renaming .htaccess file text file test if site loads well.