The full error message is
“Showing a modal dialog box or form when the application is not running in UserInteractive mode is not a valid operation. Specify the ServiceNotification or DefaultDesktopOnly style to display a notification from a service application.”
This is probably due to you using MsgBox(“so message here.”) for your web application. I learn that you can only use MsgBox for window form application.
So, the solution is to think of other way to display a message to the user.
I realized that this happened when I try to start IIS when Apache web services has started (from XAMPP). When I stop Apache, I can start IIS.
And, vice versa, if I have my IIS started, I can’t able to start Apache. Perhaps this is due to they have the same port.
So, if you encountered this error message, check if you have Apache running at that time
Managed to fix it by going to IIS > Default SMTP Virtual Server > Property > Access > Relay
Even though I still not able to receive the mail I sent out yet, but there is no more error message when I use VB.NET code (System.Net.Mail.MailMessage) to send it.
When I went to C:InetpubmailrootQueue, I saw that the mail was there. My next goal is to make sure I receive this email. I think the next I need to look into SMTP thingy at my code.
During my development, I bound into this error. The short error message is “Failure sending mail”. The long one is
Failure sending mail. —> System.Net.WebException: Unable to connect to the remote server —> System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
I googled a bit and found out that this is could be due to my SMTP services was not started. So, I went to start it but I got another message “Could not start the Simple Mail Transfer Protocol (SMTP) service on Local Computer. Error 1068: The dependency Service or group failed to start”.
So, I googled again and found out that this could be due to my IIS services was not started and so I went to start it. And guess what, there was still another error. I didn’t manage to save the error message this time.
Without giving up, I googled again and got tips to check on Event Log to see if there is any thing I can get from there. When I opened it, I saw nothing. Then, I went back to Window Services and found out that Event Log was disabled! I enabled it back, that is it. After that, I can start IIS services and SMTP services liao.
Wait a minute … as I continued with my development, I got another message, “Unable to send to all recipients”. This is will be shared in the next post.