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We have a Dynamics GP 2013 R2 Web Client implementation that has been running for several months now and recently we had two incidents where at certain locations the GP web client would stop working with the error during the initialization phase saying "An error occurred while initializing communication with the server". The error only effected two locations out of 20+ locations connected over a private WAN to GP. The quick fix is for them to run the https://*************/GP/DynamicsGPTrustedApp.msi utility and that allows the GP Web client to run again. We have not had to run this utility before and I'm not sure why out of the blue it has become a requirement at certain locations. The end users do not require the enhanced functionality that running this utility is supposed to provide but it seems to fix what ever problem is introduced. The only change I can think of that was made is the client added their domain name to the IE Trusted sites list. Forexample microsoft.com was added to the trusted sites but microsoft would be the name of the client.
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I'm wondering if you have a GPO that's affecting these locations, or actually not affecting these locations because they're having troubles reaching the dc to get the proper policies which is why the trusted app is fixing it. I've had DC issues where policies weren't being applied correctly because the DNS wasn't being resolved.
Might want to check with your network peeps if this is handled by them to see if this might be the issue.
Are you using self signed certificates or did you purchase a cert like a wild card?
If you're using self-signed then you'll need to make sure that the certs are located in the proper cert authority. I'm not sure if this scenario pertains to your situation or not but I've run across some webclient issues and most pertain to certs. Whether self-signed, expired or wildcard, I've had problems with all 3.
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