A socket operation was attempted to an unreachable network 69.28.206.212:25

[amychow]

Hi,

I am trying to use the SMS service provided by a SMS provider to send SMS from my application to mobile phone. However, the error existed "A socket operation was attempted to an unreachable network 69.28.206.212:25".

The code used is as follow:

protected void Submit_Click(object sender, EventArgs e)
{
SmtpClient client = new SmtpClient("smtp.ipipi.com");
client.Credentials = new NetworkCredential("useraccount", "password");
client.Send("useraccount@smtp.ipipi.com", "+phonenumber@sms.ipipi.com", "", "Your Message");
}

Could anyone give me any advice?

Thanks a lot!

[kmount]

Like your mail server problem this again appears to be a firewall issue accessing a remote TCP25.

For your info; I have tested that server and it works fine.

telnet 69.28.206.212 25
Trying 69.28.206.212...
Connected to 69.28.206.212.
Escape character is '^]'.
220 ipipi.com SMTP Server (JAMES SMTP Server 2.3.0) ready Wed, 18 Mar 2009 23:28:41 -0700 (PDT)
^]
telnet> quit
Connection closed

[amychow]

Like your mail server problem this again appears to be a firewall issue accessing a remote TCP25.

For your info; I have tested that server and it works fine.

How can I configure the firewall that it can access a remote TCP 25?

Thanks!

[kmount]

It depends upon whether the firewall is a hardware or software device and whether you have control of it. (It might be a block upstream you see...)

[amychow]

It depends upon whether the firewall is a hardware or software device and whether you have control of it. (It might be a block upstream you see...)

I have turn off the windows firewall and still not work.

[kmount]

Ok, how are you connected to the internet? (Is this at work I assume?).

Have you contacted your provider and had confirmation that TCP Port 25 is allowed outbound to this destination?

[amychow]

Ok, how are you connected to the internet? (Is this at work I assume?).



Have you contacted your provider and had confirmation that TCP Port 25 is allowed outbound to this destination?

No, this is at school.

I have contacted the SMS service provider and waiting for response.

For my SMTP virtual server, when I first configured the SMTP server, I can send email to outside. But I don't know why after a period, I cannot send email to outside. Maybe I made some modification after that.

[mac_shinobi]

Ok, how are you connected to the internet? (Is this at work I assume?).

Have you contacted your provider and had confirmation that TCP Port 25 is allowed outbound to this destination?

Would a router affect this ? maybe going into the routers configuration and making sure that the above port is not blocked ? Not sure as obviously my netgear allows all out going traffic but not sure if that was by default or not.

[kmount]

Yep, could be the router but more likely the upstream ISP.

[mac_shinobi]

Yep, could be the router but more likely the upstream ISP.

Wasn't debating that

[kmount]

I know, I was agreeing with you Shane.

[amychow]

Thanks everyone who gave comment here.

I may try to use another email server.

[kmount]

If you can't connect out on 25 no matter what you use it won't help! (Unless you can get out on a different port).

[Domino]

So who provides your internet connection? If its through your LEA they will need to know to allow the traffic....

[mac_shinobi]

I know, I was agreeing with you Shane.

ooopppsss - sorry