cannot telnet to SMTP port 25

  • Thread starter Thread starter sdf
  • Start date Start date
S

sdf

Hi,

I am trying to telnet from my Win2000 Professioanl to port 25 of a SMTP
server. However, I always get this error,

C:\Documents and Settings\SIF003Admin>telnet 202.172.xxx.xxx 25
Connecting To 202.172.xxx.xxx...Could not open a connection to host on port
25 :
Connect failed

I have no SMTP or IIS installed in the Windows 2000 Professional. I did
tried that but it won't work either. I believe I must be missing something.

Can someone enlighten me?

Thanks.

Best Regards,

WY
 
Is the server set up to accept Telnet connections? Is a firewall blocking
the connection either locally or at the server end?

--
Richard G. Harper [MVP Shell/User] (e-mail address removed)
* PLEASE post all messages and replies in the newsgroups
* for the benefit of all. Private mail is usually not replied to.
* My website, such as it is ... http://rgharper.mvps.org/
* HELP us help YOU ... http://www.dts-l.org/goodpost.htm
 
Hi,

There is no firewall on both ends and I can telnet into web01 from other
servers. I can telnet to web01 port 21 but just not port 25!

This is driving me mad!!! :)


Richard G. Harper said:
Is the server set up to accept Telnet connections? Is a firewall blocking
the connection either locally or at the server end?

--
Richard G. Harper [MVP Shell/User] (e-mail address removed)
* PLEASE post all messages and replies in the newsgroups
* for the benefit of all. Private mail is usually not replied to.
* My website, such as it is ... http://rgharper.mvps.org/
* HELP us help YOU ... http://www.dts-l.org/goodpost.htm


sdf said:
Hi,

I am trying to telnet from my Win2000 Professioanl to port 25 of a SMTP
server. However, I always get this error,

C:\Documents and Settings\SIF003Admin>telnet 202.172.xxx.xxx 25
Connecting To 202.172.xxx.xxx...Could not open a connection to host on
port 25 :
Connect failed

I have no SMTP or IIS installed in the Windows 2000 Professional. I did
tried that but it won't work either. I believe I must be missing
something.

Can someone enlighten me?

Thanks.

Best Regards,

WY
Click to expand...
Click to expand...
 
That server is obviously set up to not allow telnet connections.

-Frank

sdf said:
Hi,

There is no firewall on both ends and I can telnet into web01 from other
servers. I can telnet to web01 port 21 but just not port 25!

This is driving me mad!!! :)


Richard G. Harper said:
Is the server set up to accept Telnet connections? Is a firewall
blocking the connection either locally or at the server end?

--
Richard G. Harper [MVP Shell/User] (e-mail address removed)
* PLEASE post all messages and replies in the newsgroups
* for the benefit of all. Private mail is usually not replied to.
* My website, such as it is ... http://rgharper.mvps.org/
* HELP us help YOU ... http://www.dts-l.org/goodpost.htm


sdf said:
Hi,

I am trying to telnet from my Win2000 Professioanl to port 25 of a SMTP
server. However, I always get this error,

C:\Documents and Settings\SIF003Admin>telnet 202.172.xxx.xxx 25
Connecting To 202.172.xxx.xxx...Could not open a connection to host on
port 25 :
Connect failed

I have no SMTP or IIS installed in the Windows 2000 Professional. I did
tried that but it won't work either. I believe I must be missing
something.

Can someone enlighten me?

Thanks.

Best Regards,

WY
Click to expand...
Click to expand...
Click to expand...
 
sdf said:
Hi,

There is no firewall on both ends and I can telnet into web01 from other
servers. I can telnet to web01 port 21 but just not port 25!

This is driving me mad!!! :)
Click to expand...



Maybe your ISP has blocked port 25 (other than to their own SMTP servers)and
you haven't been notified?


-lyj
 
Hi,

Forgot to mention that this is a domain environment in our data center. I
can telnet into port 25 of web01 from other servers but not from this one.

Therefore, the server do accept telnet unless there is a setting on the
server that specificallt disallow telnet from this Windows 2000 Pro machine.

Thanks.

Frankster said:
That server is obviously set up to not allow telnet connections.

-Frank

sdf said:
Hi,

There is no firewall on both ends and I can telnet into web01 from other
servers. I can telnet to web01 port 21 but just not port 25!

This is driving me mad!!! :)


Richard G. Harper said:
Is the server set up to accept Telnet connections? Is a firewall
blocking the connection either locally or at the server end?

--
Richard G. Harper [MVP Shell/User] (e-mail address removed)
* PLEASE post all messages and replies in the newsgroups
* for the benefit of all. Private mail is usually not replied to.
* My website, such as it is ... http://rgharper.mvps.org/
* HELP us help YOU ... http://www.dts-l.org/goodpost.htm


Hi,

I am trying to telnet from my Win2000 Professioanl to port 25 of a SMTP
server. However, I always get this error,

C:\Documents and Settings\SIF003Admin>telnet 202.172.xxx.xxx 25
Connecting To 202.172.xxx.xxx...Could not open a connection to host on
port 25 :
Connect failed

I have no SMTP or IIS installed in the Windows 2000 Professional. I did
tried that but it won't work either. I believe I must be missing
something.

Can someone enlighten me?

Thanks.

Best Regards,

WY
Click to expand...
Click to expand...
Click to expand...
 
Hi,

Forgot to mention that this is a domain environment in our data center. I
can telnet into port 25 of web01 from other servers but not from this one.

Therefore, the server do accept telnet unless there is a setting on the
server that specificallt disallow telnet from this Windows 2000 Pro machine.

Thanks.
 
Hi,

Forgot to mention that this is a domain environment in our data center. I
can telnet into port 25 of web01 from other servers but not from this one.

Therefore, the server do accept telnet unless there is a setting on the
server that specificallt disallow telnet from this Windows 2000 Pro machine.

Thanks.
Click to expand...
How would we know that? It's your server. We do not know its settings.
 
Ports don't "self-exist". If there is no SMTP Service, then there is no
"port" to connect to. For that matter you can't "connect to a port" to
begin with,...you have to connect to a Service that is "listening" on a
particular port.


--
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com
-----------------------------------------------------
Understanding the ISA 2004 Access Rule Processing
http://www.isaserver.org/articles/ISA2004_AccessRules.html

Microsoft Internet Security & Acceleration Server: Guidance
http://www.microsoft.com/isaserver/techinfo/Guidance/2004.asp
http://www.microsoft.com/isaserver/techinfo/Guidance/2000.asp

Microsoft Internet Security & Acceleration Server: Partners
http://www.microsoft.com/isaserver/partners/default.asp
 
Never mind.
I misunderstood what you were describing.

--
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com
-----------------------------------------------------
Understanding the ISA 2004 Access Rule Processing
http://www.isaserver.org/articles/ISA2004_AccessRules.html

Microsoft Internet Security & Acceleration Server: Guidance
http://www.microsoft.com/isaserver/techinfo/Guidance/2004.asp
http://www.microsoft.com/isaserver/techinfo/Guidance/2000.asp

Microsoft Internet Security & Acceleration Server: Partners
http://www.microsoft.com/isaserver/partners/default.asp
-----------------------------------------------------


Phillip Windell said:
Ports don't "self-exist". If there is no SMTP Service, then there is no
"port" to connect to. For that matter you can't "connect to a port" to
begin with,...you have to connect to a Service that is "listening" on a
particular port.


--
Phillip Windell [MCP, MVP, CCNA]
www.wandtv.com
-----------------------------------------------------
Understanding the ISA 2004 Access Rule Processing
http://www.isaserver.org/articles/ISA2004_AccessRules.html

Microsoft Internet Security & Acceleration Server: Guidance
http://www.microsoft.com/isaserver/techinfo/Guidance/2004.asp
http://www.microsoft.com/isaserver/techinfo/Guidance/2000.asp

Microsoft Internet Security & Acceleration Server: Partners
http://www.microsoft.com/isaserver/partners/default.asp
-----------------------------------------------------



sdf said:
Hi,

I am trying to telnet from my Win2000 Professioanl to port 25 of a SMTP
server. However, I always get this error,

C:\Documents and Settings\SIF003Admin>telnet 202.172.xxx.xxx 25
Connecting To 202.172.xxx.xxx...Could not open a connection to host on port
25 :
Connect failed

I have no SMTP or IIS installed in the Windows 2000 Professional. I did
tried that but it won't work either. I believe I must be missing something.

Can someone enlighten me?

Thanks.

Best Regards,

WY
Click to expand...
Click to expand...
 
Are you running McAfee VirusScan 8.0i on the windows 2000 professional
machine? If so, 8.0i blocks outbound access on a few ports by default,
including port 25.

You can test for this by dropping to a command prompt and typing:
c:\>net stop "Network Associates McShield"
then attempting to telnet to port 25 on the destination.

If this lets you telnet out, then the port blocking is your problem!

This can be disabled for port 25 on this machine by going to the virusscan
console, right-clicking 'access protection', unchecking the box 'prevent mass
mailing worms from sending email' and then exiting ...

Be aware that this setting may be overridden by ePolicy Orchestrator if your
network uses it
 
Yup. You are dead right. McAfee VirusScan 8.0i is causing all these.
Thanks a lot for everyone!!!
 
Hi,

had the same problem in our datacenter

have a look to http://tinyurl.com/bd6em

that works

regards,

Thomas

*Hi,

I am trying to telnet from my Win2000 Professioanl to port 25 of
SMTP
server. However, I always get this error,

C:\Documents and Settings\SIF003Admin>telnet 202.172.xxx.xxx 25
Connecting To 202.172.xxx.xxx...Could not open a connection to hos
on port
25 :
Connect failed

I have no SMTP or IIS installed in the Windows 2000 Professional.
did
tried that but it won't work either. I believe I must be missin
something.

Can someone enlighten me?

Thanks.

Best Regards,

WY
Click to expand...


-
tliebsche
 
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