RE: SmtpAppender not working

6 Apr 2005 19:47:32 -0000

Right - sorry, I didn't word that very well. You know what I mean, but in case others don't, here is the source code in src/Appender/SmtpAppender.cs:

280 :                   MailMessage mailMessage = new MailMessage();
281 :                   mailMessage.Body = writer.ToString();
282 :                   mailMessage.From = m_from;
283 :                   mailMessage.To = m_to;
284 :                   mailMessage.Subject = m_subject;

... and further on,

334 :                   if (m_smtpHost != null && m_smtpHost.Length > 0)
335 :                   {
336 :                   SmtpMail.SmtpServer = m_smtpHost;
337 :                   }
338 :
339 :                   SmtpMail.Send(mailMessage);

Personally, I don't like bugs that only occur 1% of the time. They are the hardest to track down and reproduce.

Baron

--
"I am as bad as the worst, but, thank God, I am as good as the best."
    - Walt Whitman

On Wed, 6 Apr 2005 [EMAIL PROTECTED] wrote:

SmtpServer is a static property of the SmtpMail class, but MailMessage
is an object - unique for each message.

I guess you might care which mail server you send the message from, but
I can't see why it would matter for 99% of the cases.



-----Original Message-----
From: Baron Schwartz [mailto:[EMAIL PROTECTED]
Sent: Wednesday, April 06, 2005 12:24 PM
To: Log4NET User
Subject: RE: SmtpAppender not working

I agreed with you until I just thought of something: MailMessage uses
static properties to set the SMTP server etc.  Tell me if I'm wrong, but
that affects anything that's using MailMessage, on a per-process basis.
So, if my system is using MailMessage to send email, and I set my
message up and get it ready to send but then make a call to logging
functionality before actually sending the mail, it might go through a
different SMTP server than I intended, right?

I'm not sure if this is a big problem, but it could be a subtle one.
And multi-threading issues could come into play too.  That could get
tough to debug.

Baron

--
"I am as bad as the worst, but, thank God, I am as good as the best."
    - Walt Whitman

On Sat, 2 Apr 2005, Nicko Cadell wrote:

Baron,

The runtime provides SMTP support through the MailMessage. Microsoft
have chosen to implement it using their CDO library. Usually CDO works


fine, however it is possible for it to be disabled.

While it should be simple to implement a system that sends mail
directly via port 25 I'm not sure it this is necessarily the best use
of resources as CDO works out of the box.

If someone wants to look at doing this it may be best to make the mail 

sending functionality of the SmtpAppender pluggable between the
current MailMessage and an independent implementation.

Nicko

-----Original Message-----
From: Baron Schwartz [mailto:[EMAIL PROTECTED]
Sent: 24 March 2005 14:27
To: Log4NET User
Subject: RE: SmtpAppender not working

Thanks Nicko.

I have searched more on the various error messages and found that
indeed it is a problem with CDO on my laptop.  When I configure the
logging on the production machines, it works fine.  I'm not familiar
with what CDO is or how/why it's not working on my laptop, other than

maybe I borked it up when I turned off every non-essential service (I 

believe the Systems staff has all sorts of stuff running on the
production servers... not my job).

I did try using the fully qualified name of the SMTP machine, and
even its IP address; like I said I've had no problems with sending to


that machine with the SMTP software I've written (telnet, too).

I looked through the source code for the SmtpAppender more.
I'm not sure how many people would use the more advanced settings,
such as sending through the credentials of the process under which
log4net runs -- and I know it's bad to reinvent the wheel.  But, just


to play devil's advocate, is there any justification for an SMTP
appender which sends via plain SMTP, without relying on
System.Web.Mail?  SMTP is trivial to implement, and this might ease
the problems, and may even be more efficient as an appender.  I saw a


lot of griping on the Internet about this CDO issue, with no real
resolutions.  It sounds like there may be some Microsoftish "extend
the standard" issues with CDO.  But I'm no expert on it, as I said.

Baron

On Thu, 24 Mar 2005, Nicko Cadell wrote:

  "The transport failed to connect to the server"

It looks like the CDO implementation on the machine cannot
access the 
mail server.

You config is fine for accessing an unauthenticated mail relay.

Can you try telneting directly into your mail server from the box
running your app:

  telnet madrid 25

Type in "HELO" the server should respond with some helpful message.
Type "QUIT" to exit. Does this work?
Have you tried specifying the smtpHost as a fully qualified
domain name?
or as an IP address? It may be that the CDO library cannot
resolve the 
name.

Are you running any local firewall software that may be blocking
outbound connections, for some or all users or applications?

There seems to be several other people having the same problem with
various fixes discussed here:


http://www.google.co.uk/search?q=transport+failed+to+connect+to+the+s
e

rv
er+CDO

Nicko


-----Original Message-----
From: Baron Schwartz [mailto:[EMAIL PROTECTED]
Sent: 21 March 2005 16:57
To: [email protected]
Subject: SmtpAppender not working

Hi,

I've searched the web and read the manual and some of the
code, but 
feel free to point me somewhere there's an answer... I can't find
much on this.

My SmtpAppender isn't able to connect to the smtpHost.  I'm on
Windows using MS framework v1.1.  Here's my config file
([EMAIL PROTECTED] 
is bogus -- I'm using a real value), test code, and the error I'm
getting in the console window when the log fails to
email. The SMTP
server, madrid, is an open relay inside our firewall,
which requires 
no authentication or anything.
I send mail with it from a bunch of other apps.

One thing I did notice, is that apparently there are some other
parameters I could be putting in the config file, but I'm
not sure 
what they should be (the example config seems to be incomplete).
Starting at SmtpAppender.cs, and looking at its
properties, it looks 
like username, password etc *could* be put in the config file.  I
didn't read through enough of the code to determine what the
parameters would be named, because they wouldn't be necessary for
this application, but if someone points me to how I can
find it out 
(short of stepping through the code) I'm happy to update the
example, or augment it with a more complete example.

Thanks for any help.

--- Snip ---
<?xml version="1.0" encoding="utf-8" ?> <configuration>
    <configSections>
        <section name="log4net"
type="log4net.Config.Log4NetConfigurationSectionHandler,
log4net" /> 
    </configSections>
    <log4net>
        <appender name="SmtpAppender"
type="log4net.Appender.SmtpAppender">
            <to value="[EMAIL PROTECTED]" />
            <from value="[EMAIL PROTECTED]" />
            <subject value="Baaaaad error" />
            <smtpHost value="madrid" />
            <bufferSize value="4" />
            <lossy value="true" />
            <evaluator type="log4net.Core.LevelEvaluator">
                <threshold value="WARN"/>
            </evaluator>
            <layout type="log4net.Layout.PatternLayout">
                <conversionPattern value="%-5p %-20t %d
%c line %L%n 
%m%n" />
            </layout>
        </appender>
        <root>
            <appender-ref ref="SmtpAppender" />
        </root>
    </log4net>
    <appSettings>
    </appSettings>
</configuration>
--- Snip ---
using System;
using log4net;
using log4net.Config;
namespace TestHarness {
    public class TestHarness {
        static readonly ILog log =
LogManager.GetLogger(typeof(TestHarness));
        public static void Main(string[] args) {
            XmlConfigurator.Configure();
            log.Warn("hey, this is an error!");
        }
    }
}
--- Snip ---
log4net:ERROR [SmtpAppender] Error occurred while sending e-mail
notification.
System.Web.HttpException: Could not access 'CDO.Message'
object. ---> System.Ref
lection.TargetInvocationException: Exception has been
thrown by the 
target of an  invocation. --->
System.Runtime.InteropServices.COMException
(0x80040213): The
transport failed to connect to the server.

   --- End of inner exception stack trace ---
   at System.RuntimeType.InvokeDispMethod(String name,
BindingFlags
invokeAttr, Object target, Object[] args, Boolean[]
byrefModifiers, 
Int32 culture, String[]
namedParameters)
   at System.RuntimeType.InvokeMember(String name, BindingFlags
invokeAttr, Bind er binder, Object target, Object[] args,
ParameterModifier[] modifiers, CultureI nfo culture, String[]
namedParameters)
   at System.Type.InvokeMember(String name, BindingFlags
invokeAttr, 
Binder bind er, Object target, Object[] args)
   at System.Web.Mail.LateBoundAccessHelper.CallMethod(Type
type, Object obj, St ring methodName, Object[] args)
   at System.Web.Mail.LateBoundAccessHelper.CallMethod(Object
obj, String method Name, Object[] args)
   --- End of inner exception stack trace ---
   at System.Web.Mail.LateBoundAccessHelper.CallMethod(Object
obj, String method Name, Object[] args)
   at System.Web.Mail.CdoSysHelper.Send(MailMessage message)
   at System.Web.Mail.SmtpMail.Send(MailMessage message)
   at log4net.Appender.SmtpAppender.SendBuffer(LoggingEvent[]
events)








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