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Dynamics 365 Community / Forums / Microsoft Dynamics GP (Archived) / GP Web Client not conn...
Microsoft Dynamics GP (Archived)

GP Web Client not connecting from workstations

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Posted on by Richard Wheeler 75,788 Moderator

I just installed another web client for GP 2015 R2 and all works fine on the server.  However, from all the workstations I get the message about an exception occurring and in the event viewer on the server I see this message:


"System.Web.HttpException (0x80004005): Server cannot set status after HTTP headers have been sent."

This appears to be a generic message but what does it mean for the GP web client and how do I get workstations to connect to the web client?

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  • Richard Wheeler Profile Picture
    Richard Wheeler 75,788 Moderator on at
    RE: GP Web Client not connecting from workstations

    Hey, we are talking Windows based products here. WYSISYG is alive and well. If at first you don't succeed keep trying every possibility under the sun.  Good work Bill and thanks!

  • Bill Campbell Profile Picture
    Bill Campbell on at
    RE: GP Web Client not connecting from workstations

    Richard / Beat, thanks to both of you for some insights into this issue, so we have connections to both our TEST Worksatations.

    What it took for us, had nothing to do with SSL as it turns out, it had to do with the version of IE and Silverlight that was running on the two workstations.

    Once updated to IE-11 and latest Silverlight - all is well.  We did not have mess with SSL or IIS or anything else on the server.

    Maybe something to look at Richard - you never know if a 'version' mismatch is the root to all evils

  • Beat Bucher GP Geek GPUG All Star Profile Picture
    Beat Bucher GP Gee... 28,058 Moderator on at
    RE: GP Web Client not connecting from workstations

    Yes I know... but Self-signed SSL are not considered as a 'trusted' source authentication, and thus need to be placed on every workstation in the root certificate authority folder.

    This could also be achieved thru some distribution mechanism as far as I can understand from the Domain admin.

  • Bill Campbell Profile Picture
    Bill Campbell on at
    RE: GP Web Client not connecting from workstations

    So we also have a self signed - for testing only configuration - I will have to check with the IT to find out if they have 'installed' the cert at the client machines.  That does make some sense, but oh, what a chore this configuration is at times.

  • Beat Bucher GP Geek GPUG All Star Profile Picture
    Beat Bucher GP Gee... 28,058 Moderator on at
    RE: GP Web Client not connecting from workstations

    It definitely looks like an SSL issue... I had that same behaviour the first time I attempted to setup the GP web client on the server side... missing the proper SSL references left me in the dust. Talking at Convergence to some GP web guru from MS helped to solve the mystery. The SSL needs to be referenced at least in 3 different places if I recall correctly.

    I used a self-signed certificate from our Domain too at the second install attempt and it worked like a charm after that.

    Of course, if you intend to expose the Web site to outside your corporate network, I'd strongly suggest to go for a 3rd-party SSL that is already recognized as a valid 'trusted' authority.

  • Richard Wheeler Profile Picture
    Richard Wheeler 75,788 Moderator on at
    RE: GP Web Client not connecting from workstations

    This is for testing purposes and right now they are using a self-signed SSL certificate. Perhaps there is something in their configuration that is preventing this from being installed. I will check with their IT team.

  • Beat Bucher GP Geek GPUG All Star Profile Picture
    Beat Bucher GP Gee... 28,058 Moderator on at
    RE: GP Web Client not connecting from workstations

    Richard and Bill,

    This might sound a silly question, but did you deployed the SSL certificate on all the remote workstations where the Web client is launched ?

    Also check if the Compatibility View mode is disabled and that you're on the latest SilverLight version...

  • Richard Wheeler Profile Picture
    Richard Wheeler 75,788 Moderator on at
    RE: GP Web Client not connecting from workstations

    I asked my client to open case with Microsoft. Let me check to see if they did. I have not heard anything.

  • Bill Campbell Profile Picture
    Bill Campbell on at
    RE: GP Web Client not connecting from workstations

    Richard, I know it is the weekend, but I have just encountered a similar situation.

    My web client works fine on the server, but the two clients appear to log on, but sit on the 'Please wait while we ......' page for what feels like ever.  I can not find an error to review in the Event Viewer on the workstation.  

    Any suggestion on where to look for the error you mentioned?

  • Richard Wheeler Profile Picture
    Richard Wheeler 75,788 Moderator on at
    RE: GP Web Client not connecting from workstations

    I will certainly do that. We tried rearranging the group in the OU but that did not help. Very strange that it works on the server but not from any of the workstations.

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