W
WAFDOF
Guest
I have an unusual issue that I believe it related to a setting in the IIS
SMTP Virtual Server Settings.
I have an intermittent problem where an email sent by a small asp.net
application would fail to send the exception was "Error receiving data from
socket." The VB error message generated related to "The transport failed to
connect to the server. "
I spent a bit of time troubleshooting the asp code only to have the same
results...sometimes the emails would process and sometimes they would
not.....no variable changed at all.
In an attemtp to find a pattern to the problem and rule out asp.net code I
wrote a very small windows application that sends an email once a minute and
reports back the results. I was amazed to find a solid pattern and this is
where I could use some help pointing me in the right direction.
The sever sends an email once a minute and the first 9 emails send fine but
the next 9 emails will fail to send and then the pattern repeats itself the
next 9 emails go fine, then will send 9 emails that fail...etc.
Nothing changed in the settings...each email was sent using hardcoded
variables so there would be no difference in the TO: FROM: SUBJECT: SMTP
SERVER: or BODY.
I have run this for several hours always with the same pattern revealing
itself, 9 times it will send email then 9 times it will fail then 9 times it
will send and so on.
Now for the server details. This is a development server running behind out
INTRANET firewall. All virus software has been disabled. The Firewall on
the server has been disabled. The application is running ON the server. The
situation manifiest itself both in using windows applications and Web pages
(asp.net).
These are the current property settings of the virtual server:
IP Address is within the IP range of the intranet - 10.16.56.9
Connections limited to 100
connection time-out in minutes 5
Under advanced theIP Address and TCP Port are 10.15.56.9 25
Access tab - Anonymous access is checked
connection control as access granted to 10.16.56.9
relay restictions are granted to 10.16.56.9
connection control grrants access for 10.16.56.9 to the virtual server
Messages tab
Message size limited to 2048 KB
Session size limited to 10240KB
Limit number of message per connection to 100
Limit number of recipients to 100
Delivery tab
First realy interval minutes 15
Second retry 30
third retry 60
subsequent retry 240
delay notification 12 min
Expiration timeout 30 min
Loca delay 24 min
Expiration timeout 12 min
Outbound security set to anonymous access
Outbound connections limited to 1000
time-out 2 minutes
number of connections per domaim 100
TCP port 25
These settings have been changed a few times as I gleen what I can from the
internet. I have stopped and started the the SMTP Virtual Server on variable
changes without effect.
The TO: from: variables for the email are valid as they have been checked
and email is actually sent and received using the same variables.
Obviously I am curious about the pattern I have discovered. Each minute an
identical email is sent...and as I have said the first 9 times the email goes
fine then the next 9 times it will fail and then the next 9 times it will go
fine..and so on. I have not been able to find a variable in the SMTP
porperties that is tied to this apparent 10 min cycle.
This server does not touch the INTERNET and the SMTP mail being sent stays
within the intranet of our organization.
What additional information may be needed to look into the unusual
circumstance?
WAFDOF
SMTP Virtual Server Settings.
I have an intermittent problem where an email sent by a small asp.net
application would fail to send the exception was "Error receiving data from
socket." The VB error message generated related to "The transport failed to
connect to the server. "
I spent a bit of time troubleshooting the asp code only to have the same
results...sometimes the emails would process and sometimes they would
not.....no variable changed at all.
In an attemtp to find a pattern to the problem and rule out asp.net code I
wrote a very small windows application that sends an email once a minute and
reports back the results. I was amazed to find a solid pattern and this is
where I could use some help pointing me in the right direction.
The sever sends an email once a minute and the first 9 emails send fine but
the next 9 emails will fail to send and then the pattern repeats itself the
next 9 emails go fine, then will send 9 emails that fail...etc.
Nothing changed in the settings...each email was sent using hardcoded
variables so there would be no difference in the TO: FROM: SUBJECT: SMTP
SERVER: or BODY.
I have run this for several hours always with the same pattern revealing
itself, 9 times it will send email then 9 times it will fail then 9 times it
will send and so on.
Now for the server details. This is a development server running behind out
INTRANET firewall. All virus software has been disabled. The Firewall on
the server has been disabled. The application is running ON the server. The
situation manifiest itself both in using windows applications and Web pages
(asp.net).
These are the current property settings of the virtual server:
IP Address is within the IP range of the intranet - 10.16.56.9
Connections limited to 100
connection time-out in minutes 5
Under advanced theIP Address and TCP Port are 10.15.56.9 25
Access tab - Anonymous access is checked
connection control as access granted to 10.16.56.9
relay restictions are granted to 10.16.56.9
connection control grrants access for 10.16.56.9 to the virtual server
Messages tab
Message size limited to 2048 KB
Session size limited to 10240KB
Limit number of message per connection to 100
Limit number of recipients to 100
Delivery tab
First realy interval minutes 15
Second retry 30
third retry 60
subsequent retry 240
delay notification 12 min
Expiration timeout 30 min
Loca delay 24 min
Expiration timeout 12 min
Outbound security set to anonymous access
Outbound connections limited to 1000
time-out 2 minutes
number of connections per domaim 100
TCP port 25
These settings have been changed a few times as I gleen what I can from the
internet. I have stopped and started the the SMTP Virtual Server on variable
changes without effect.
The TO: from: variables for the email are valid as they have been checked
and email is actually sent and received using the same variables.
Obviously I am curious about the pattern I have discovered. Each minute an
identical email is sent...and as I have said the first 9 times the email goes
fine then the next 9 times it will fail and then the next 9 times it will go
fine..and so on. I have not been able to find a variable in the SMTP
porperties that is tied to this apparent 10 min cycle.
This server does not touch the INTERNET and the SMTP mail being sent stays
within the intranet of our organization.
What additional information may be needed to look into the unusual
circumstance?
WAFDOF