My forum can't send email to activate register and it show error when I open my forum in first time

[Warayut Saena]

After I open my forum in first it show error like this every time.

com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException: Communications link failure due to underlying exception: 

** BEGIN NESTED EXCEPTION ** 

java.net.SocketException
MESSAGE: Broken pipe

But after I refresh my forum it show normal page and have no error.

And whenI test register my forum, it not send email for activate to my email. So, I go to Configulations page and send my email at Send a test email but it show error like this.

Error while sending the email: 
 net.jforum.exceptions.MailException: javax.mail.AuthenticationFailedException

[Ulf Dittmer]

Not sure about the first error, but the second sounds like JavaMail is not set up correctly. Are the various mail.smtp.* properties in SystemGlobals.properties configured correctly so that mail can be sent using your mail server?

[Warayut Saena]

I try to config at Configurations.

Email Address to use as "sender"
SMTP Server
SMTP Port
SMTP Server requires authorization?
Requires SSL?
SMTP username ( only if using authorization )
SMTP password ( only if using authorization )

but I have same error.