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TOPIC: Help! - Joomla backend sign-in window is blank.

Help! - Joomla backend sign-in window is blank. 3 years 2 months ago #65021

  • howard_56
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wheine wrote:
Thank you, Nick (& Mark)!

Replacing with:
if (($user->get('guest')) || !$user->authorise('core.login.admin'))

was the trick.

Hello everyone,

I had a similar problem: but mine gave a complete white screen when trying to log in to the back-end of Joomla 2.5.1 site.
I changed the helper.php file statement from:
if ($user->get('guest')) {

to:
if ($user->authorise('core.login.admin')) {

The other statement did not workout.
But it did not solve the problem yet. I now get the same screen Wheine describes in his introduction of the issue.
Feel free to look it up at joomla251.howardwoei.nl/administrator/index.php

I would appreciate any help here.
Kind regrards
Howard
Last Edit: 3 years 2 months ago by howard_56.
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Help! - Joomla backend sign-in window is blank. 3 years 2 months ago #65072

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Hi Howard,

Hope you had a good weekend!

Please create a backup of your site, then upgrade your Joomla version to 2.5.9 by unzipping the following .zip into your Joomla root:
joomlacode.org/gf/download/frsrelease/17...e-Update_Package.zip

That will reset all your core files and also update you to 2.5.9. Afterward, your site should be fixed.

Hope this helps!

Kind regards,
Nick
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Help! - Joomla backend sign-in window is blank. 3 years 2 months ago #65127

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Hello Nick,

Thanks for your quick response. I downloaded the update file and tried to unzip it with several unzip tools (php scripts that I found on the web) but they refuse to verwrite the existing files in the joomla root. The directories and file are set to chmod 777, so that should not be the problem.
I will start a new questions for this in the right category.
If that issue is solved i 'll post the result of your tip on this issue here,
Thank you so far.
Kind regards
Howard
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Help! - Joomla backend sign-in window is blank. 3 years 2 months ago #65177

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Nick wrote:
Hi Howard,

Hope you had a good weekend!

Please create a backup of your site, then upgrade your Joomla version to 2.5.9 by unzipping the following .zip into your Joomla root:
joomlacode.org/gf/download/frsrelease/17...e-Update_Package.zip

That will reset all your core files and also update you to 2.5.9. Afterward, your site should be fixed.

Hope this helps!

Kind regards,
Nick

Hi Nick,

I unzipped the update on my local disk and uploaded them by FTP.
Sadly this does'nt fix the problem: I still have a completely white screen when i go to the back-end url: joomla251.howardwoei.nl/administrator/index.php

Do you have any other suggestions?
Thank you in advance
Kind regards
Howard
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Help! - Joomla backend sign-in window is blank. 3 years 2 months ago #65179

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Hi Howard,

Ok, it's likely a rogue plugin then. Please go to your configuration.php file and turn error reporting to "maximum" within it. The following tutorial should be of help for that:
www.ostraining.com/blog/joomla/guided-to...nfigurationphp-file/

Afterward, see if you get a detailed error message instead of a blank page.

Kind regards,
Nick
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Last Edit: 3 years 2 months ago by Nick. Reason: Added a clarification
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Help! - Joomla backend sign-in window is blank. 3 years 2 months ago #65402

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Hi Nick,
I changed the configuration.php: literally to
public $error_reporting = 'maximum';
On the administrator/index.php I don't get any error reports. Still just a blank page.


Now that you mentioned a rogue plugin, I suddenly remember installing the component extplorer 2.1.3 just before the issue of the blanc back-end page occured.
When I tried to run extplorer the first time i did not get any resluts.

I did remove the files of this component in both the components directory from the Joomla root and the adminstrator. I searched for any similar issue reports on the site extplorer.net/ but did not find anything.

But on the other hand I also did change user rights just before the issue occured. As you explained this was a bug in J2.5.1. Should I clean up something regarding to the session in de database ?

Thanks for your patience; this issue surely is a challenge I guess.
Kind regards
Howard
Last Edit: 3 years 2 months ago by howard_56.
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Help! - Joomla backend sign-in window is blank. 3 years 2 months ago #65413

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Hi Howard,

Sorry to hear that! Would you send me some FTP and/or hosting login credentials to This email address is being protected from spambots. You need JavaScript enabled to view it. so I can take a quick look for you? Also, please do two things for me:
1) Include a link to this forum post in the email
and
2) After sending the email, reply to this forum post letting me know you sent the email so that I can check it..

Kind regards,
Nick
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Help! - Joomla backend sign-in window is blank. 3 years 2 months ago #65423

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Hello Nick,

The requested information has been sent.

Looking forward for the next steps I can take

Kind regards

Howard
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Help! - Joomla backend sign-in window is blank. 3 years 2 months ago #65506

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Hi Howard,

Hope you had a good weekend!

I'm looking at the site now and tried a few things that haven't worked. However, while looking at it in Firebug's net tab I noticed that almost all the media files display as 403 errors, which means they are restricted. For example, joomla251.howardwoei.nl/media/system/js/core-uncompressed.js . That's likely the reason why the admin is blank, though not necessarily. I'm trying a fix now and I'll let you know how it goes.

Kind regards,
Nick
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Help! - Joomla backend sign-in window is blank. 3 years 2 months ago #65509

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Hi Howard,

Your backend is accessible now. However, I'm still switching permissions (FTP takes a while) and will hopefully be done shortly.

In the mean time, please give the following tutorials a look:
www.ostraining.com/blog/joomla/admin-too...nd-file-permissions/
www.ostraining.com/blog/joomla/how-to-ch...nd-file-permissions/

Kind regards,
Nick
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Help! - Joomla backend sign-in window is blank. 3 years 2 months ago #65525

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Hi Howard,

Your site should be about as good as new now. I did a number of fixes (Permissions, fixed database, repaired and optimized tables, reset core files, etc).

Hope you enjoy your site! 😀

Kind regards,
Nick
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The following user(s) said Thank You: howard_56

Help! - Joomla backend sign-in window is blank. 3 years 2 months ago #65565

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Hi Nick,
What a wonderfull job. Thanks you so much and I wish you guys all the best overthere.

Kind regards
Howard
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Help! - Joomla backend sign-in window is blank. 3 years 2 months ago #65575

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You're very welcome, Howard! Glad we could be of help! 😀

Cheers,
Nick
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