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Subject Topic: SMTP/SSL - SMTP Service Not Available Post ReplyPost New Topic
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Joined: 10 November 2003
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Posted: 10 August 2005 at 12:05pm | IP Logged Quote Guests
I can run SMTP outgoing with no problem from my VB.NET web project on my local Win XP machine. When a .NET Windows Service calls the project put up on the Win 2003 server this error is logged: No such IP or SMTP service is not available, Error #4. An SMTP port has been opened on the server. The Win Service is also successful when calling my local machine. Is something missing in the Windows Service, or the Windows 2003 Server?

Thanks
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Alex
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Posted: 10 August 2005 at 12:33pm | IP Logged Quote Alex
Maybe firewall is installed which block access to certain ports for certain IP's (so that SMTP on SSL port connection cannot be established from web server to mail server while it succeeds from your workstation).

Or, SMTP port is fine but SMTP SSL port (if you're using dedicated port) is blocked.

To check this, open telnet on the same machine where your software which tries to connect to mail server is installed (Win 2003 server), and try to connect manually on the same port (465 or which port you're using):

telnet mail.server port

What happens? If telnet says the connection could not be established, you must reconfigure something on SMTP server or firewall.

Regards,
Alex
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Posted: 12 August 2005 at 3:23pm | IP Logged Quote Guests
Found that the reason could not get through on the server was due to McAfee. Once the SMTP port was opened thru McAfee, worked just fine.

Thanks
John
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Alex
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Posted: 12 August 2005 at 9:25pm | IP Logged Quote Alex
Many thanks for posting back. This solution may be useful for other developers as well.

Regards,
Alex

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