[pmwiki-users] Users not logged in get a blank page

Peter van Es vanes.peter at gmail.com
Tue Mar 31 12:10:30 PDT 2020

Hi Petko,

thanks for your suggestion. 

Engine and Main are Groups of Wiki pages. They do not have php code and do not make calls.
I did check the troubleshooting page, but there are no error messages and no php errors (I set-up logging in php.ini)
I disabled all the add-ons in local/config.php, but no difference, still blank pages.
I also checked all the file and directory permissions and ownership of the files, Groups and upload directories.

I enabled diagnostics, and looked at the page using ?action=ruleset but it doesn’t tell me much  https://www.sl113.org/wiki/Engine/Start?action=ruleset <https://www.sl113.org/wiki/Engine/Start?action=ruleset> 

The page displays, but then there are no pictures on it.

I am using Auth-SMF and this has always worked well. Even now, when logged in, the Wiki works correctly. 

I’m thinking of a problem when $AuthId = ‘’; (i.e. blank) and there is a .jpg or .png picture meant to be shown on the page.


> On 31 Mar 2020, at 19:34, Petko Yotov <5ko at 5ko.fr> wrote:
> Let's say that we need to first try to fix the blank pages problem and then the SMF integration (unless it is the integration that causes the blank pages).
> Also: there appear to be 3 addons for SimpleMachinesForum integration in the PmWiki cookbook, which one do you use?
> Petko
> On 31/03/2020 19:28, Petko Yotov wrote:
>> Completely blank pages without any message often are caused by a call
>> to a function that is not defined - either mis-typed or
>> deprecated/removed.
>> I'd review all files in the "local" directory if some of them, notably
>> those starting with "Engine" and "Main", make some suspicions calls.
>> Otherwise, see the page Troubleshooting in the documentation -- it can
>> be an older addon that calls an undefined function, or that calls
>> htmlspecialchars(). Troubleshooting contains instructions on how to
>> track the cause:
>>  https://www.pmwiki.org/wiki/PmWiki/Troubleshooting
>> First section for tracking, see also the section on blank pages near
>> the middle of that page.
>> Petko
>> --
>> If you upgrade :  http://www.pmwiki.org/Upgrades
>> On 31/03/2020 18:48, Peter van Es wrote:
>>> I have a weird problem on my PmWiki, and it’s behaviour has recently
>>> started changing.
>>> I have a recent PMWiki installation (version 2.2.127) running on a
>>> Ubuntu 16.04.4 LTS version, with a recent plesk update and php7.3
>>> It coexists with a SimpleMachinesForum (SMF) installation which is
>>> used for user authentication. That install was recently upgraded to
>>> version 2.0.17
>>> Users logged into the forum have no problem seeing all the content of
>>> my Wiki (except for restricted pages) — even if they do not have
>>> edit rights.
>>> However users not logged into the forum, who used to be able to see
>>> all non-restricted content, now get served a completely blank page.
>>> I do not have a log in box, because most people log in via the forums.
>>> Then their
>>> 	* AuthId:
>>> 	* Author:
>>> are both blank (empty).
>>> I have no php errors in my log.
>>> The other weird thing: pages which show up blank have images (i.e.
>>> uploads) on them. The file and directory access rights have all been
>>> set correctly.
>>> A page which shows up blank is:
>>> https://www.sl113.org/wiki/Engine/Start but it should not
>>> Whereas this page just shows: https://www.sl113.org/wiki/Brake/Start
>>> Restricted pages show a login box:
>>> https://www.sl113.org/wiki/Restricted/Start and start with Group
>>> Restricted
>>> The startpage of my wiki is: https://www.sl113.org/wiki/ which has a
>>> picture and shows just fine…
>>> What I would like to achieve is that anonymous browsers can see all of
>>> my non-restricted content on the Wiki again…

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