500: No such host is known

Hello there, I am new to bot development and after spending couple of days I managed to get a bot up and running using the emulator. Everything was working fine locally with the emulator and I went about deploying it to azure. I configured ngrok on the emulator following the documentation to debug the cloud hosted version and since then I have not been able to get the emulator working even for local bot. I reset all the ngrok configuration but I keep getting “No such host is known” everytime it hits the line

if (member.Id != turnContext.Activity.Recipient.Id)
                {
                    await turnContext.SendActivityAsync(MessageFactory.Text(welcomeText, welcomeText), cancellationToken);
                }

I even started a new echo bot project but I keep getting the same 500 on every bot project locally. I spend few hours looking for resolution but I could not find any which resolve this issue.

emulatorerror.zip

Could someone please help as I was so close to publishing my first bot to teams and now I am completely stuck. I am running the default Echo bot created with Visual Studio and connecting the emulator.

[sharadnair]

@tonyanziano I think i found the issue. Only realised it when you asked for service url. It is mispelled losthost. It must have got messed up when i was doing the ngrok configuration - which makes sense as all this stopped working after i configured ngrok. It was hard to find out though

[tonyanziano]

I think I see the problem, the ServiceUrl property in the Activity has the value http://losthost:53822. Usually the value is localhost.

If you go into your Emulator, and open the settings page, do you happen to have anything in the localhost override input?