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on-prem Dynamics PowerShell error

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Posted on by DipakAch

Hi Guys,

When I try to run any Dynamics commands on PowerShell, I get "The underlying connection was closed: an unexpected error occurred ". Anyone seen this or have idea why this is happening?

Thank you

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Community Member Microsoft Employee on at

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RE: on-prem Dynamics PowerShell error

This problem occurs when the server or another network device unexpectedly closes an existing Transmission Control Protocol (TCP) connection. Analyze the server logs to see if this may be the issue.
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DipakAch 30 on at

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RE: on-prem Dynamics PowerShell error

All, I was able to fix this error by replacing actual cert SAN to the field Deployment Web Service URL under Dynamics 365 Deployment manager. Hope this helps someone :)
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Adrian Begovich 21,009 Super User 2024 Season 2 on at

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RE: on-prem Dynamics PowerShell error

Hi DipakAch,

Dynamics 365 (online) version 9.x and Dynamics 365 (online) Government version 8.2, requires that connections to customer engagement applications are secured by TLS 1.2 (or better) security.

Try including the below line in your Powershell Script before you call Get-CrmConnection.

[System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType]::Tls12