SMTP works over LAN (Internet) but not dialup

[Guest]

I have a strange one here. I have a client who has an email account with a
local ISP over a dialup connection. He uses Outlook 2000 running on XP Pro
with SP2. His email had been working fine for at least a year. About 3 days
ago he suddenly could only receive mail over the dialup connection - he can
no longer send. I attempted to telnet from his PC to his mail server on port
25 but it times out. Outlook alternately gives a 0x800ccc0f - connection
unexpectedly reset be server error - or a 0x800ccc0e unable to establish
connection with server message. Here's the really interesting part; if I
bring his PC to my office and use my broadband connection (different ISP) to
connect everything works OK - both send and receive. Of course his ISP says
everthing is OK on their end. I have disabled and even completely uninstalled
both his Symantec Antivirus 2005 and Microsoft Antispyware with no effect on
the problem. I have reset the IP stack mutltiple times. I am just wondering
if its not some type of corruption at layer 2 and perhaps I need to look at
the dialup configuration. ???

 

[Diane Poremsky [MVP]]

many isp's block access to other SMTP servers as a way to reduce spam
generated by hijacked computers - your dialup isp likely began SMTP
blocking.

 

[Lanwench [MVP - Exchange]]

In

I have a strange one here. I have a client who has an email account
with a local ISP over a dialup connection. He uses Outlook 2000
running on XP Pro with SP2. His email had been working fine for at
least a year. About 3 days ago he suddenly could only receive mail
over the dialup connection - he can no longer send. I attempted to
telnet from his PC to his mail server on port 25 but it times out.
Outlook alternately gives a 0x800ccc0f - connection unexpectedly
reset be server error - or a 0x800ccc0e unable to establish
connection with server message. Here's the really interesting part;
if I bring his PC to my office and use my broadband connection
(different ISP) to connect everything works OK - both send and
receive. Of course his ISP says everthing is OK on their end. I have
disabled and even completely uninstalled both his Symantec Antivirus
2005 and Microsoft Antispyware with no effect on the problem. I have
reset the IP stack mutltiple times. I am just wondering if its not
some type of corruption at layer 2 and perhaps I need to look at the
dialup configuration. ???

Can you set him up temporarily to use another dialup account and see whether
the same thing occurs? Try using the same dialup account on another machine
to see if you can telnet? Seems you've already isolated the problem with
this particular dialup account on his PC.

 

[Guest]

many isp's block access to other SMTP servers as a way to reduce spam
generated by hijacked computers - your dialup isp likely began SMTP
blocking.

--
Diane Poremsky [MVP - Outlook]
Author, Teach Yourself Outlook 2003 in 24 Hours
Coauthor, OneNote 2003 for Windows (Visual QuickStart Guide)
Need Help with Common Tasks? http://www.outlook-tips.net/beginner/

I have a strange one here. I have a client who has an email account with a
local ISP over a dialup connection. He uses Outlook 2000 running on XP Pro
with SP2. His email had been working fine for at least a year. About 3
days
ago he suddenly could only receive mail over the dialup connection - he
can
no longer send. I attempted to telnet from his PC to his mail server on
port
25 but it times out. Outlook alternately gives a 0x800ccc0f - connection
unexpectedly reset be server error - or a 0x800ccc0e unable to establish
connection with server message. Here's the really interesting part; if I
bring his PC to my office and use my broadband connection (different ISP)
to
connect everything works OK - both send and receive. Of course his ISP
says
everthing is OK on their end. I have disabled and even completely
uninstalled
both his Symantec Antivirus 2005 and Microsoft Antispyware with no effect
on
the problem. I have reset the IP stack mutltiple times. I am just
wondering
if its not some type of corruption at layer 2 and perhaps I need to look
at
the dialup configuration. ???

True, a lot of ISPs do block SMTP, but not usually for dialup accounts. If
anything they ususally block it for Internet access from outside their
domain(s) or address ranges. It's interesting that in this case when I
access the ISP's mail server from my provier (RoadRunner) it works fine
including telneting in...so they're not blocing SMTP on the mail server
itself. Otherwise I could not telnet into the mail server on port 25 and
get a response nor would I be able to send from the users account without any
problem. I know for example if try to send mail using RoadRunner's mail
servers when I'm connectecd through another ISP it will not work...we're only
allowed web access or RoadRunner dialup. I guess it's possible the client's
ISP accidentaly blocked SMTP at the DIALUP access point. I would think they
would notice that rather quickly though as it seems like all of their dialup
users would notice the problem. I suppose that if you weren't careful you
could mess up someone's account in a RADIUS server and block just one dialup
user from sending.

 

[Guest]

In

Can you set him up temporarily to use another dialup account and see whether
the same thing occurs? Try using the same dialup account on another machine
to see if you can telnet? Seems you've already isolated the problem with
this particular dialup account on his PC.

This is the only account they have (very tight budget). I could set the
same account up on my notebook PC and see what happens...but of course the
user doesn't have his dialup or e-mail passwords written down. His ISP is
somewhat slow to respond to help request so I was hoping to avoid having to
deal with them until I could say conclusively that the probelm was at their
end. What I really need is a way to monitor the traffic between his PC and
the mail server over the dialup connection... then I could see the
progression of the attempted SMTP session settup between his PC and the mail
server. Anyone know of a tool that can do this?

 

[Guest]

I have a strange one here. I have a client who has an email account with a
local ISP over a dialup connection. He uses Outlook 2000 running on XP Pro
with SP2. His email had been working fine for at least a year. About 3 days
ago he suddenly could only receive mail over the dialup connection - he can
no longer send. I attempted to telnet from his PC to his mail server on port
25 but it times out. Outlook alternately gives a 0x800ccc0f - connection
unexpectedly reset be server error - or a 0x800ccc0e unable to establish
connection with server message. Here's the really interesting part; if I
bring his PC to my office and use my broadband connection (different ISP) to
connect everything works OK - both send and receive. Of course his ISP says
everthing is OK on their end. I have disabled and even completely uninstalled
both his Symantec Antivirus 2005 and Microsoft Antispyware with no effect on
the problem. I have reset the IP stack mutltiple times. I am just wondering
if its not some type of corruption at layer 2 and perhaps I need to look at
the dialup configuration. ???

I'm no longer troubleshhoting this from the user end. I recovered his dialup
and email account passwords and used them to set up a profile on my notebook.
I got the same results with my notebook...can't send over dialup...works fine
over broadband so it HAS to be something on the provider's end.

Thanks to all.

 

[Lanwench [MVP - Exchange]]

In

I'm no longer troubleshhoting this from the user end. I recovered his
dialup and email account passwords and used them to set up a profile
on my notebook. I got the same results with my notebook...can't send
over dialup...works fine over broadband so it HAS to be something on
the provider's end.

Thanks to all.

You're welcome - hope you have luck with the ISP.