Hello Community,

Recently my SMTP settings on DNN host >Advanced setting no longer work. Nothing has changed on my SMTP as far as  settings and I can still send/receive on outlook and other mail programs just DNN can no longer send i'm not sure why.

This is the error on the event viewer.
ssemblyVersion:7.3.2

PortalID:0

PortalName:Onlinecommunity.info | online community info | online communities builders

UserID:1

UserName:host

ActiveTabID:16

ActiveTabName:Host Settings

RawURL:/Host/Host-Settings/portalid/0

AbsoluteURL:/Default.aspx

AbsoluteURLReferrer:http://onlinecommunity.info/Host/Host-Settings/portalid/0

UserAgent:Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.104 Safari/537.36

DefaultDataProvider:DotNetNuke.Data.SqlDataProvider, DotNetNuke

ExceptionGUID:974f6d8f-ee11-47af-bd82-9c00ac6c87b5

InnerException:Failure sending mail.

FileName:

FileLineNumber:0

FileColumnNumber:0

Method:System.Net.Mail.SmtpReplyReaderFactory.ProcessRead

StackTrace:

Message:

System.Net.Mail.SmtpException: Failure sending mail. ---> System.IO.IOException: Unable to read data from the transport connection: net_io_connectionclosed. at System.Net.Mail.SmtpReplyReaderFactory.ProcessRead(Byte[] buffer, Int32 offset, Int32 read, Boolean readLine) at System.Net.Mail.SmtpReplyReaderFactory.ReadLines(SmtpReplyReader caller, Boolean oneLine) at System.Net.Mail.SmtpReplyReaderFactory.ReadLine(SmtpReplyReader caller) at System.Net.Mail.SmtpConnection.GetConnection(ServicePoint servicePoint) at System.Net.Mail.SmtpClient.Send(MailMessage message) --- End of inner exception stack trace --- at System.Net.Mail.SmtpClient.Send(MailMessage message) at DotNetNuke.Services.Mail.Mail.SendMailInternal(MailMessage mailMessage, String subject, String body, MailPriority priority, MailFormat bodyFormat, Encoding bodyEncoding, IEnumerable`1 attachments, String smtpServer, String smtpAuthentication, String smtpUsername, String smtpPassword, Boolean smtpEnableSSL)