Disabling TLSv1.0 causes O365 collections to fail

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Article ID: 100048326

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Updated On:

Description

Error Message

Job log:
02/04/2020 13:35:05 Collection job info: TaskRunID: 0.34.6.1601 Task ID: 0.27.6.1601 Message: Failed: Remote host closed connection during handshake Type: FAIL User: 0.14.3.1:0.14.6.1 Date: Tue Feb 04 13:35:05 EST 2020

ExchangeAutoDiscovery_output.log:
2020-02-04 13:35:04,873 [5972] INFO oDiscoveryParams - SSL Service started
2020-02-04 13:35:05,025 [5972] ERROR oDiscoveryParams - System.ComponentModel.Win32Exception: The client and server cannot communicate, because they do not possess a common algorithm

Cause

This is caused by eDP 9.1.x using .NET 3.5.  TLSv1.2 is not supported with .NET 3.5.

Resolution

Support for TLSv1.2 is included with the release of eDP 9.5 and it's usage of .NET 4.7.2.

Issue/Introduction

Disabling TLSv1.0 on an eDiscovery Platform (eDP) server via the following registry key will cause all O365 collections to fail:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Server
DWORD: Enabled
Value: 0 (change from 1 to 0)
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