"Internal Server Error" on the backend - Joomla! Forum - community, help and support

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i'm stumped - /administrator backend throwing following error immediately:

internal server error

the server encountered internal error or misconfiguration , unable complete request.

please contact server administrator, cgiadmin@yourhostingaccount.com , inform them of time error occurred, , might have done may have caused error.

more information error may available in server error log.

my logs show following error, repeatedly: 2012-11-30 17:17:54 info xxx.xxx.xx.xxx joomla failure: username , password not match or not have account yet.

the frontend works fine, although users have mentioned they've gotten same error when trying submit content. use yootheme's zoo, have not had error before. seems recent - within few weeks. it's been intermittent until earlier today.

any thoughts?

    it has not been established far can see, doing before started error?
  1. is default joomla login or login module associated third party template?
  2. please specify precise error notices receive, if not included above.
  3. are there errors listed in log files server/in joomla_root/ log files?
  4. is a:
    1. new installation?
    2. migration?
    3. upgrading joomla 2.5.x latest release?
  5. were you:
    1. adding or updating extensions?
    2. changing template?
    3. uninstalling/deleting extensions?
    4. editing database?
    5. modifying acl permissions aspect of site or backend?
    6. editing core files?
  6. transferring files by
    • moving joomla_root/ directory , contents within host?
    • changing host?
    • moving local remote server?
  7. changing user authentication methods (modifying active plugin)
  8. has host updated server?
  9. do have backup of site before issue started occur?
  10. please run forum post assistant provide information try , resolve issue.





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