Black screen presentation

[Kenwrick Chan]

Folks,
I just did an upgrade to BigBlueButton Server 2.2.15 (1977). It was
working fine prior to the upgrade but now the default.pdf renders as a
black screen. Replacing that pdf with a vanilla pdf still defaults to
a black screen. If I upload a jpg (which converts to a pdf) it still
shows a black screen.

So I don't think it's an issue with layers in the pdf. Is anyone
experiencing a similar issue?

Thanks,
Kenwrick

[Kenwrick Chan]

Sorry, this one is solved.

We were bit by a InCommon intermediate chain issue.

bbb-conf --debug is your friend.

kenwrick

[Paul Belcher]

Hi,

I recently upgraded also to 2.2.16.  I have the same issue, my default.pdf file does not show up in the meeting and whatever I attempt to upload does not display.  I check the debug and found no recent error messages after attempting to upload a new ppt file.

Please advise,

Thanks,

Paul

[Paul Belcher]

I also noticed that the icon to toggle the display of the presentation is no long available in the meeting.

Paul

On Tuesday, June 2, 2020 at 1:46:44 PM UTC-4, Kenwrick Chan wrote:

[Gmail]

Hi Paul,

In my case bbb-conf --debug showed errors in connecting.   As it turns out there was a recent issue with InCommon intermediate certificates.   I didn't catch it when I was doing a review of affected servers since Nginix doesn't use them directly but expects the certificate reference to include the certificate and intermediate files together in a single file. After doing that and restarting the black screen went away (along with the error messages). 

Kenwrick 

On Jun 3, 2020, at 4:19 AM, Paul Belcher <paul.b...@msn.com> wrote:



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[Peter Reichartz]

Hi.

We have had the same issues here since 2.2.15, bbb-conf --debug shows no errors. According to IT, the fullchain is already in use, so the certificate is probably not the cause. Sometimes the presentation is displayed after a very long wait, but only in parts. Mostly black screen. I appreciate ideas, thank you in advance.

Peter

[Kenwrick Chan]

Peter,
In our case bbv-conf --debug returned a bunch of
/var/log/bigbluebutton/bbb-web.2020-06-02.log:2020-06-02T08:18:53.411-10:00
WARN i.l.c.protocol.ConnectionWatchdog - Cannot reconnect:
io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection
refused: /127.0.0.1:6379

That's led me to check the state of ssl. So the error is connecting
to itself at port 6379

This would show if it's open
netstat -ntlp | grep LISTEN | grep 6379

Perhaps traffic is going on some stray route that has intermittent
issues. Perhaps doing a sudo bbb-conf --setip hostname could reset
things that an upgrade may have set in.

kenwrick

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[Paul Belcher]

Yes Kenwrick,

I am getting the same error, i.e. "Connection refused: /127.0.0.1:6379".  I also see that the port is open.  Running the SETIP did not change anything.

Paul

On Tuesday, June 2, 2020 at 1:46:44 PM UTC-4, Kenwrick Chan wrote:

[Gmail]

Paul, 

For me to solution was to install a new certificate file consisting of certificate and intermediate certificate in a similar fashion to what's listed here: https://www.ssls.com/knowledgebase/how-to-install-an-ssl-certificate-on-a-nginx-server/

In our case the InCommon intermediate certificate was outdated.  There is probably some method to verify the certificate that you have is correct or you can ask your sys admin guys to verify since other users had a similar error message with a bad certificate/intermediate certificate file.  If you look into the file you should see two sets of certificates in there. 

Kenwrick 

On Jun 4, 2020, at 4:48 PM, Paul Belcher <paul.b...@msn.com> wrote:



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[Reimar Bauer]

my default presentation is also not shown. uploading a presentation works.

bbb-conf --restart

hints to
# Error: Unable to reach default URL for presentation:
# Check value for beans.presentationService.defaultUploadedPresentation in
# /usr/share/bbb-web/WEB-INF/classes/bigbluebutton.properties

now investigating ;)

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[Kenwrick Chan]

In a vanilla install the file would be located in
/var/www/bigbluebutton-default. Is there a default.pdf there with
permissions that is readable by the application?

> # Check value for beans.presentationService.defaultUploadedPresentation in
> # /usr/share/bbb-web/WEB-INF/classes/bigbluebutton.properties

doing a grep of default.pdf in "bigbluebutton.properties" we see
beans.presentationService.defaultUploadedPresentation=${bigbluebutton.web.serverURL}/default.pdf

Which is how the standard install of "default.pdf" is set.
kenwrick

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[Reimar Bauer]

Hi

I found the reason for me and tried to improve the documentation.

https://github.com/bigbluebutton/bigbluebutton.github.io/pull/151/commits/cdc269a33c5e1a28631c3fd86278cf557d8fba94

regards
Reimar

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