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Random build crash with “The Build Agent is not running on the Mac”

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Hi all,

We’ve recently upgraded our local CI server building our Xamarin solution to the latest VS2017. Before it was still using VS2015.
Since that time, about 30% of our build fails randomly with the following error:
The Build Agent 'Build 4.8.0.753' is not running on the Mac. Please ensure that the assembly versions between the XMA Agents and the XMA clients matches. A compatible Build Agent is needed in order to finish the build.

On the Mac build log, here is what we get:
Xamarin.Messaging.Build.BuildAgent: Information: 0: Stopping Agent: Build: 2018-01-09 10:12:44Z
System.Net.Mqtt.Sdk.MqttClientImpl: Error: 0: No session has been found for the client
at System.Net.Mqtt.Sdk.MqttClientImpl.CloseClientSession () [0x00098] in <65aadb65fa...>
at System.Net.Mqtt.Sdk.MqttClientImpl+d__34.MoveNext () [0x00035] in <65aadb65fa...>
System.Net.Mqtt.Sdk.MqttClientImpl: Information: 0: Client - Disposing. Reason: Error:

In the APPDATA\Local\Xamarin\Logs of our Windows machine, there is nothing special.

The versions we are using on both our Windows machine and Mac mini:
Windows: Visual Studio 2017, version 15.5.2
* Windows 2012r2
* Java Development Kit 8u152
* Xamarin 4.8.0.753
* Xamarin Designer 4.8.188
* Xamarin.Android SDK 8.1.0.25
* Xamarin.iOS and Xamarin.Mac SDK 11.6.1.2

Mac: Visual Studio 2017 for Mac, version 7.3.2.12
* Mac OS X 10.13.2
* Mono: 5.4.1.7
* Xamarin.Android 8.1.0.25
* Xamarin.iOS 11.6.1.2
* Xamarin.Mac 4.0.0.214

Any idea?
Thanks for your help
Alex


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