Thread View: borland.public.jbuilder.java.api
4 messages
4 total messages
Started by George
Wed, 18 Feb 2004 20:41
javax.mail api issue
Author: George
Date: Wed, 18 Feb 2004 20:41
Date: Wed, 18 Feb 2004 20:41
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I have written a small Swing-based application that functions as a POP3 email client. When I am connected to my ISP over dialup from home, this program works fine and I am able to retrieve my email messages; however when I use the program from work (where my internet connection is over the office LAN), the attempt to connect fails with a MessagingException that is caused by a java.net.ConnectException: Connect Timed Out. Any ideas on what the issue is? TIA
Re: javax.mail api issue
Author: Gillmer J. Derge (TeamB)
Date: Wed, 18 Feb 2004 20:43
Date: Wed, 18 Feb 2004 20:43
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George wrote: > When I am connected to my ISP over dialup from home, this > program works fine and I am able to retrieve my email messages; however when > I use the program from work (where my internet connection is over the office > LAN), the attempt to connect fails with a MessagingException that is caused > by a java.net.ConnectException: Connect Timed Out. Some businesses configure their firewalls to block access to external POP servers, because they don't want their employees reading personal email at work. Are you able to check your mail from work using a different program? Try "telnet host.domain.com 110" to see if you can connect at all to the POP server. It may not be your program's problem at all. -- Gillmer J. Derge (TeamB)
Re: javax.mail api issue
Author: George
Date: Wed, 18 Feb 2004 21:17
Date: Wed, 18 Feb 2004 21:17
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I tried to use Microsoft Outlook Express to connect to my ISP from work and this is the error message I got: The connection to the server has failed. Account: 'postoffice.worldnet.att.net', Server: 'postoffice.worldnet.att.net', Protocol: POP3, Port: 110, Secure(SSL): No, Socket Error: 10060, Error Number: 0x800CCC0E I also tried to telnet to the mail server from work but it couldnt open a connection either. So I guess this is a firewall issue. Excuse my networking ignorance but I'm curious: how does Yahoo Messenger work on my PC at work? That needs to connect externally too. Thanks. I tried to telnet to the ISP's mail server on port 110 but "Gillmer J. Derge (TeamB)" <spam@gillmerderge.com> wrote in message news:4033ce7c$2@newsgroups.borland.com... > George wrote: > > When I am connected to my ISP over dialup from home, this > > program works fine and I am able to retrieve my email messages; however when > > I use the program from work (where my internet connection is over the office > > LAN), the attempt to connect fails with a MessagingException that is caused > > by a java.net.ConnectException: Connect Timed Out. > > Some businesses configure their firewalls to block access to external > POP servers, because they don't want their employees reading personal > email at work. Are you able to check your mail from work using a > different program? Try "telnet host.domain.com 110" to see if you can > connect at all to the POP server. It may not be your program's problem > at all. > > -- > Gillmer J. Derge (TeamB)
Re: javax.mail api issue
Author: Gillmer J. Derge (TeamB)
Date: Wed, 18 Feb 2004 21:26
Date: Wed, 18 Feb 2004 21:26
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George wrote: > Excuse my networking ignorance but I'm curious: how does Yahoo Messenger > work on my PC at work? That needs to connect externally too. Each type of service uses a different port number. For example, HTTP uses port 80, NNTP (news) is port 119, POP is port 110, etc. Firewalls typically block specific ports, so blocking port 110 for POP is quite common. They probably just don't have a filter on whatever port Messenger is using. That's also the same reason you can probably reach external sites with your web browser -- it's a different port. -- Gillmer J. Derge (TeamB)
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