Bug 58410 - After a disconnection from Mac Build Agent, can reconnect only after a restart of Visual Studio
Summary: After a disconnection from Mac Build Agent, can reconnect only after a restar...
Alias: None
Product: Visual Studio Extensions
Classification: Xamarin
Component: iOS ()
Version: unspecified
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2017-07-26 10:41 UTC by steott
Modified: 2017-09-23 22:16 UTC (History)
6 users (show)

Is this bug a regression?: ---
Last known good build:

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Description steott 2017-07-26 10:41:56 UTC
Maybe this is a following of issue #36063

This "disconnection" issue is still happening to me several times per day.

I've noticed that a lot of times the disconnection happens during a strange situation that I have with Parallels Desktop.
Every one or two hours, my Windows virtual machine changes automatically time just for a few seconds (e.g. if it's 8:30 AM, it goes to 10:30 AM), and then it goes automatically back to the right time. 
I haven't understood yet what is causing this problem, I've even opened a ticket on Parallels Forum, but I haven't solved yet the problem.

Anyway, when this issue happens, Visual Studio disconnects from the Mac Build Agent (hosted in the same physical machine), and there is no way to reconnect to it without closing Visual Studio.
As soon as I close Visual Studio and open again the project, it reconnects to the Mac Build Agent, but then I have to execute at least a rebuild (sometimes even more than one) to have the correct version compiled.

This "disconnection" issue is not a stopping one (I can solve it by closing Visual Studio, open again the project, do a rebuild), but it's quite frustrating, because it makes me lose some minutes and, worst of all, concentration :(  
If Visual Studio could reconnect automatically to the host, and don't require the rebuild, it would be way better.

I have the last stable version of every software (Windows 10, MacOS X, Visual Studio 2017, Xamarin iOS, ...).

This are the logs from Visual Studio:

Starting connection to Mac
Starting Broker in port 55066...
Connection successfully established with the Mac
Starting agents on Mac Stefano’s MacBookPro (
Starting Agent IDB
Starting Agent Build
Agent Build is running
Agent IDB is running
Connected to the Mac Stefano’s MacBookPro ( with Full support.
Disconnected from the Mac Stefano’s MacBookPro (
The underlying client has been disconnected by the remote host
Starting reconnection...
Starting connection to Mac
Disconnected from the Mac Stefano’s MacBookPro (
Starting connection to Mac
Starting Broker in port 52938...
Disconnected from the Mac Stefano’s MacBookPro (
Comment 1 Prashant [MSFT] 2017-07-26 11:43:58 UTC
Thanks so much for taking the time to submit this report! 
I’m unable to reproduce this issue using the latest Visual Studio 2017 Preview version 15.3. 

Could you try turn off `Set time automatically` in Windows? to see if it solves the issue

Please attach the following to help us reproduce this issue: 
-Detailed reproduction steps 
-Version information (Help → About Microsoft Visual Studio → Copy Info) 
-Logs (Help → Xamarin → Zip Logs (last 7 days)) 
-Optional: project to reproduce your issue
Comment 2 mag@xamarin.com 2017-08-24 18:09:46 UTC
We introduced improvements on the auto re connection handling when something unexpected happens. We also detected and fixed some issues that were preventing the connection to work again if the reconnection didn't work. So you shouldn't need to restart VS to get it working.

These changes and fixes are by now available on the latest Alpha channel version.

If you test with this version and still notice unexpected behavior, please let us know and also attach the Ide.log from '%LOCALAPPDATA%\Xamarin\Logs\<version>\', which will help us to see what is really happening.

By now and given that we didn't receive more details, I will mark this issue as Resolved.
Comment 3 DmytroBondarenko 2017-09-23 22:16:17 UTC
I have also similar problem. 
In general after 10-20minutes of activity or inactivity, after VS and project were opened, VS loose it's connection to the OSx. 

VS 15.3.5
Xamarin ios

VS 7.1.5.b2
Xamarin ios 11

zipped log -