404 error when trying to update 3.5.1 to 3.6.5. - Joomla! Forum - community, help and support

greetings can help. having similar issue on website. when attempt upgrade using upgrade component, 404 error.

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here results forum post assistant

last php error(s) reported :: forum post assistant (v1.2.7) : 6th march 2017 wrote:[13-dec-2015 18:29:14 america/chicago] php warning: session_start(): cannot send session cache limiter - headers sent (output started @ /home2/#mysite#/public_html/#mysite#.com/ent/libraries/joomla/session/session.php:665) in /home2/#mysite#/public_html/#mysite#.com/ent/libraries/joomla/session/session.php on line 665

forum post assistant (v1.2.7) : 6th march 2017 wrote:

basic environment :: wrote:joomla! instance :: joomla! 3.5.1-stable (unicorn) 05-april-2016
joomla! platform :: joomla platform 13.1.0-stable (curiosity) 24-apr-2013
joomla! configured :: yes | read-only (444) | owner: #mysite# (uid: 1/gid: 1) | group: #mysite# (gid: 1) | valid for: 3.5
configuration options :: offline: 0 | sef: 1 | sef suffix: 0 | sef rewrite: 0 | .htaccess/web.config: no | gzip: 0 | cache: 0 | ftp layer: 0 | ssl: 0 | error reporting: default | site debug: 0 | language debug: 0 | default access: 5 | unicode slugs: 0 | database credentials present: yes

host configuration :: os: linux | os version: 3.12.65-188.elk6.x86_64 | technology: x86_64 | web server: apache | encoding: gzip, deflate | doc root: /home1/#mysite#/public_html/#mysite#.com | system tmp writable: yes

php configuration :: version: 5.5.38 | php api: cgi-fcgi | session path writable: yes | display errors: 1 | error reporting: 32759 | log errors to: error_log | last known error: 13th december 2015 18:29:14. | register globals: | magic quotes: | safe mode: | open base: | uploads: 1 | max. upload size: 64m | max. post size: 64m | max. input time: 60 | max. execution time: 30 | memory limit: 256m

mysql configuration :: version: 5.5.51-38.2 (client:5.5.51-38.2) | host: --protected-- (--protected--) | collation: utf8_unicode_ci (character set: utf8) | database size: 12.61 mib | #of tables:  235

detailed environment :: wrote:php extensions :: core (5.5.38) | date (5.5.38) | ereg () | libxml () | openssl () | pcre () | sqlite3 (0.7-dev) | zlib (2.0) | bcmath () | bz2 () | calendar () | ctype () | curl () | dom (20031129) | hash (1.0) | fileinfo (1.0.5) | filter (0.11.0) | ftp () | gd () | gettext () | gmp () | spl (0.2) | iconv () | session () | intl (1.1.0) | json (1.2.1) | mbstring () | mcrypt () | mssql () | mysql (1.0) | mysqli (0.1) | odbc (1.0) | standard (5.5.38) | pdo (1.0.4dev) | pdo_mysql (1.0.2) | pdo_sqlite (1.0.1) | phar (2.0.2) | posix () | pspell () | reflection ($id: dc76d2fe0f3e9c327c1d4ca617d94e26c7fae98d $) | imap () | simplexml (0.1) | soap () | sockets () | exif (1.4 $id: 74b652b3ebe78882b8006d49c17cac029fe8a5d0 $) | tidy (2.0) | tokenizer (0.1) | wddx () | xml () | xmlreader (0.1) | xmlrpc (0.51) | xmlwriter (0.1) | xsl (0.1) | zip (1.11.0) | cgi-fcgi () | imagick (3.1.2) | mhash () | ioncube loader () | zend guard loader () | zend engine (2.5.0) |
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) ::

extensions discovered :: wrote:components :: site :: com_mailto (3.0.0) | com_wrapper (3.0.0) | os_eway (1.0) | os_paypal (1.0) | os_offline (1.0) | os_authnet (1.0) | wf_anchor_title (2.6.8) | wf_visualblocks_title (2.6.8) | wf_nonbreaking_title (2.6.8) | wf_article_title (2.6.8) | wf_link_title (2.6.8) | wf_style_title (2.6.8) | wf_contextmenu_title (2.6.8) | wf_print_title (2.6.8) | wf_searchreplace_title (2.6.8) | wf_fontselect_title (2.6.8) | wf_visualchars_title (2.6.8) | [do not buy our kitchens!] (2.6.8) | wf_inlinepopups_title (2.6.8) | wf_cleanup_title (2.6.8) | wf_xhtmlxtras_title (2.6.8) | wf_formatselect_title (2.6.8) | wf_source_title (2.6.8) | wf_clipboard_title (2.6.8) | wf_lists_title (2.6.8) | wf_emotions_title (2.6.8) | wf_textcase_title (2.6.8) | wf_layer_title (2.6.8) | wf_directionality_title (2.6.8) | wf_browser_title (2.6.8) | wf_preview_title (2.6.8) | wf_charmap_title (2.6.8) | wf_styleselect_title (2.6.8) | wf_autosave_title (2.6.8) | wf_hr_title (2.6.8) | wf_spellchecker_title (2.6.8) | wf_fontcolor_title (2.6.8) | wf_fullscreen_title (2.6.8) | wf_table_title (2.6.8) | wf_imgmanager_title (2.6.8) | wf_fontsizeselect_title (2.6.8) | wf_media_title (2.6.8) | wf_aggregator_vine_title (2.6.8) | wf_aggregator_dailymotion_titl (2.6.8) | [youtube] (2.6.8) | wf_aggregator_vimeo_title (2.6.8) | wf_filesystem_joomla_title (2.6.8) | wf_links_joomlalinks_title (2.6.8) | wf_popups_jcemediabox_title (2.6.8) | wf_popups_window_title (2.6.8) | wf_link_search_title (2.6.8) |
components :: admin :: com_cache (3.0.0) | com_installer (3.0.0) | com_postinstall (3.2.0) | com_modules (3.0.0) | akeeba (4.7.4) | com_languages (3.0.0) | com_redirect (3.0.0) | com_checkin (3.0.0) | com_finder (3.0.0) | com_plugins (3.0.0) | com_newsfeeds (3.0.0) | com_menus (3.0.0) | com_templates (3.0.0) | os membership (1.6.9) | com_eventgallery (3.5.6) | com_categories (3.0.0) | com_users (3.0.0) | com_login (3.0.0) | com_tags (3.1.0) | com_search (3.0.0) | com_joomlaupdate (3.0.0) | com_ajax (3.2.0) | com_config (3.0.0) | com_messages (3.0.0) | com_weblinks (3.5.0) | com_cpanel (3.0.0) | com_jce (2.6.8) | com_admin (3.0.0) | com_banners (3.0.0) | com_content (3.0.0) | com_media (3.0.0) | com_contenthistory (3.2.0) |

modules :: site :: mod_whosonline (3.0.0) | mod_eventgallery_latest (3.5.6) | mod_articles_category (3.0.0) | mod_wrapper (3.0.0) | mod_eventgallery_categories (3.5.6) | mod_articles_popular (3.0.0) | mod_related_items (3.0.0) | mod_tags_similar (3.1.0) | mod_eventgallery_events (3.5.6) | mod_banners (3.0.0) | mod_tags_popular (3.1.0) | mod_articles_categories (3.0.0) | mod_random_image (3.0.0) | mod_eventgallery_event (3.5.6) | mod_articles_archive (3.0.0) | mod_stats (3.0.0) | mod_custom (3.0.0) | mod_feed (3.0.0) | mod_articles_latest (3.0.0) | mod_login (3.0.0) | mod_syndicate (3.0.0) | mod_menu (3.0.0) | mod_articles_news (3.0.0) | mod_search (3.0.0) | membership plans (1.5.1) | mod_eventgallery_custom (3.5.6) | mod_weblinks (3.5.0) | mod_breadcrumbs (3.0.0) | mod_eventgallery_cart (3.5.6) | mod_users_latest (3.0.0) | mod_finder (3.0.0) | mod_footer (3.0.0) | s5 register (1.6.0) | mod_languages (3.0.0) |
modules :: admin :: mod_stats_admin (3.0.0) | mod_quickicon (3.0.0) | mod_logged (3.0.0) | mod_submenu (3.0.0) | mod_multilangstatus (3.0.0) | mod_custom (3.0.0) | mod_title (3.0.0) | mod_feed (3.0.0) | mod_login (3.0.0) | mod_latest (3.0.0) | mod_menu (3.0.0) | mod_popular (3.0.0) | mod_version (3.0.0) | mod_toolbar (3.0.0) | mod_online (1.6.0) | mod_unread (1.6.0) | mod_status (3.0.0) |

plugins :: site :: plg_content_pagebreak (3.0.0) | plg_content_jce (2.6.8) | plg_content_finder (3.0.0) | eventgallery_fields_category (3.5.6) | allvideos (by joomlaworks) (4.7.0) | allvideos (by joomlaworks) (4.7.0) | membership plans content plugi (1.5.0) | plg_content_vote (3.0.0) | plg_eventgallery_content (3.5.6) | plg_content_loadmodule (3.0.0) | content - membership pro conte (1.5.0) | s5 media player (2.1.0) | plg_content_pagenavigation (3.0.0) | plg_content_joomla (3.0.0) | plg_content_emailcloak (3.0.0) | plg_content_geshi (3.0.0) | plg_eventgallery_multilangcont (3.5.6) | plg_twofactorauth_yubikey (3.2.0) | plg_twofactorauth_totp (3.2.0) | plg_finder_content (3.0.0) | plg_finder_contacts (3.0.0) | plg_finder_tags (3.0.0) | plg_eventgallery_finder (3.5.6) | plg_finder_newsfeeds (3.0.0) | plg_finder_categories (3.0.0) | plg_finder_weblinks (3.5.0) | plg_installer_jce (2.6.8) | plg_installer_eventgallery (3.5.6) | plg_installer_webinstaller (1.1.0) | plg_user_profile (3.0.0) | plg_user_joomla (3.0.0) | plg_user_contactcreator (3.0.0) | os membership - cb plugin (1.0) | os membership - easysocial plu (1.0) | os membership - group membersh (1.0) | os membership - account creati (1.6.5) | os membership - k2 items restr (1.0) | os membership - urls restricti (1.0) | os membership - joomla groups (1.0) | os membership - docman plugin (1.0) | os membership user (1.0.0) | os membership - joomsocial plu (1.0) | membership pro - mailchimp plu (1.0) | os membership - acymailing plu (1.0) | os membership - articles restr (1.0) | os membership - userprofile pl (1.0) | os membership - invoice genera (1.5.1) | os membership - membership id (1.1.1) | plg_extension_jce (2.6.8) | plg_extension_joomla (3.0.0) | plg_captcha_recaptcha (3.4.0) | plg_editors-xtd_pagebreak (3.0.0) | plg_editors-xtd_article (3.0.0) | plg_editors-xtd_image (3.0.0) | plg_editors-xtd_eventgallery (3.5.6) | plg_editors-xtd_readmore (3.0.0) | plg_editors-xtd_module (3.5.0) | plg_editors_jce (2.6.8) | plg_editors_codemirror (5.12) | plg_editors_tinymce (4.3.3) | plg_eventgallery_sur_standard (3.5.6) | plg_system_highlight (3.0.0) | plg_system_stats (3.5.0) | plg_system_jce (2.6.8) | plg_system_languagecode (3.0.0) | os membership articles restric (1.0.0) | os membership update subscribe (1.0.0) | plg_system_picasaupdater (3.5.6) | os membership registration red (1.5.1) | plg_system_debug (3.0.0) | plg_system_log (3.0.0) | plg_system_p3p (3.0.0) | plg_system_languagefilter (3.0.0) | system - s5 flex menu (1.0) | system os membership cleaner (1.6.5) | plg_system_sef (3.0.0) | os membership k2 items restric (1.0.0) | plg_system_cache (3.0.0) | plg_system_backuponupdate_titl (3.7) | plg_system_remember (3.0.0) | plg_system_updatenotification (3.5.0) | system - woopra 4 joomla (1.0) | plg_system_redirect (3.0.0) | plg_system_logout (3.0.0) | os membership reminder (1.0.0) | os membership urls restriction (1.0.0) | plg_search_content (3.0.0) | plg_search_contacts (3.0.0) | plg_search_tags (3.0.0) | plg_eventgallery_search (3.5.6) | plg_search_newsfeeds (3.0.0) | plg_search_categories (3.0.0) | plg_search_weblinks (3.5.0) | plg_eventgallery_pay_standard (3.5.6) | plg_eventgallery_pay_paypal (3.5.6) | plg_eventgallery_pay_paypalbas (3.5.6) | plg_authentication_cookie (3.0.0) | plg_authentication_gmail (3.0.0) | plg_authentication_ldap (3.0.0) | plg_authentication_joomla (3.0.0) | plg_eventgallery_ship_email (3.5.6) | plg_eventgallery_ship_standard (3.5.6) | plg_eventgallery_ship_download (3.5.6) | plg_quickicon_jce (2.6.0-pro-bet) | plg_quickicon_joomlaupdate (3.0.0) | plg_quickicon_akeebabackup (1.0) | plg_quickicon_extensionupdate (3.0.0) |

templates discovered :: wrote:templates :: site :: beez5 (2.5.0) | shape5_vertex (3.0) | protostar (1.0) | atomic (2.5.0) | beez_20 (2.5.0) | beez3 (3.1.0) |
templates :: admin :: bluestork (2.5.0) | hathor (3.0.0) | isis (1.0) |

if have akeeba backup, try disabling , perform update (disable related akeeba backup). in cases, cause of problem akeeba backup.

also, try updating akeeba backup before updating joomla - might solve problem. make sure backup website (filesystem + database) before doing anything.