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Dynamics 365 Community / Forums / Microsoft Dynamics CRM (Archived) / Outlook Client - The c...
Microsoft Dynamics CRM (Archived)

Outlook Client - The caller was not authenticated by the service

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Posted on by Rolando Sacramento 5

Hi Experts,

May I know if you encountered the error below and how did you resolve it?

It is generated by 'Outlook plugin' when we tried connecting to an organization.

Version: Dynamics CRM 2016 Update 1 - On-Premise

07:09:28| Info| Error connecting to URL: test/.../Discovery.svc Exception: System.ServiceModel.Security.SecurityNegotiationException: The caller was not authenticated by the service. ---> System.ServiceModel.FaultException: The request for security token could not be satisfied because authentication failed.
at System.ServiceModel.Security.SecurityUtils.ThrowIfNegotiationFault(Message message, EndpointAddress target)
at System.ServiceModel.Security.SspiNegotiationTokenProvider.GetNextOutgoingMessageBody(Message incomingMessage, SspiNegotiationTokenProviderState

Any advice please?

*This post is locked for comments

  • Suggested answer
    prt33k Profile Picture
    prt33k 6,907 on at
    RE: Outlook Client - The caller was not authenticated by the service

    Ah...

    VPN does have connectivity issue - please use below to configure the port etc

    blogs.technet.microsoft.com/.../ports-to-be-opened-for-configuring-crm-outlook-client-over-vpn

    Thanks,

    Prateek

  • Rolando Sacramento Profile Picture
    Rolando Sacramento 5 on at
    RE: Outlook Client - The caller was not authenticated by the service

    Hi Prateek,

    The machine is operating within the VPN.

  • prt33k Profile Picture
    prt33k 6,907 on at
    RE: Outlook Client - The caller was not authenticated by the service

    Hi Rolando,

    Are the client machine joined to the domain? Or are you having IFD?

    These are prerequisite to get outlook plugin work in a on-prem env.

    Thanks,

    Prateek

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