Issue with sending test email - Sitecore Email Campaign Manager 3.3

Question

When I try to send test email(all templates except Plain Text) I see this error in the log:

ERROR Exception: System.Net.WebException
Message: The connection to the remote server can not be established.
Source: System
at System.Net.HttpWebRequest.GetResponse ()
at Sitecore.Modules.EmailCampaign.Core.WebContent.DownloadString (String url, Boolean useIisCredentials, String user agent)
nested exception
Exception: System.Net.Sockets.SocketException
Message: It could not be established because the target machine actively refused

When I test it with Plain Text message all works fine.

On the ecm.requestbody page I see this exception:

exception: The connection to the remote server can not be established.
    at System.Net.HttpWebRequest.GetResponse ()
    at ASP.sitecore_admin_ecm_requestbody_aspx.DownloadString (String url, Boolean useIisCredentials, String iisUser, String iisPass)  

Fields IIS.User and IIS.Password in the file Sitecore.EmailExperience.Core.config is also filled

Answer 1

It was a stupid issue with wrong hostname in my hosts(system32/driver/etc/hosts) file

Answer 2

Check your Base URL setting on your EXM manager root - it should be the URL of your Sitecore instance.

More on manager roots here:

https://doc.sitecore.net/email_experience_manager/30/setting_up_exm/the_manager_root/the_manager_root_settings

If that doesn't fix your issue there's a good knowledge base article here:

https://kb.sitecore.net/articles/553662