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date: Mon, 17 Dec 2007 03:13:00 -0800,    group: microsoft.public.exchange.connectivity        back       


ex 2k3 smtp outbound connections refused    
hello out there.
i'm trying to track down problems with outbound mail transfer. When our 
server (2k3 server/ex 2k3 sp2) is confronted with big load of mails he 
completely stops sending outbound mail.
for my research i'd need some information about the following:
I'm using perfmon: does smtp-messages sent total count a mail to x 
recipients as one mail or as x mails?
is it a normal average to have 5% of smtp-outbound_connections_total droped 
(smtp-outbound_connection_refused)?

thank you in advance
date: Mon, 17 Dec 2007 03:13:00 -0800   author:   freytshy

Re: ex 2k3 smtp outbound connections refused    
This could be ISP related or Exchange or Firewall configuration related. 
What type of WAN connection do you have?  As for Exchange config, check your 
SMTP VS Delivery Tab- Outbound Connections to insure your not limited by the 
number you are sending.  Check your Firewall for any restrictions regarding 
SMTP outbound.

-- 
John Oliver, Jr
MCSE, MCT, CCNA
Exchange MVP 2008
Microsoft Certified Partner


"freytshy"  wrote in message 
news:FE1A8128-0F2E-4AE4-8743-09635DEC7472@microsoft.com...
> hello out there.
> i'm trying to track down problems with outbound mail transfer. When our
> server (2k3 server/ex 2k3 sp2) is confronted with big load of mails he
> completely stops sending outbound mail.
> for my research i'd need some information about the following:
> I'm using perfmon: does smtp-messages sent total count a mail to x
> recipients as one mail or as x mails?
> is it a normal average to have 5% of smtp-outbound_connections_total 
> droped
> (smtp-outbound_connection_refused)?
>
> thank you in advance
date: Mon, 17 Dec 2007 15:24:06 -0500   author:   John Oliver, Jr. [MVP]

Re: ex 2k3 smtp outbound connections refused    
dear John.
in our org we send about 4500 mails a day, we have a 10mbps guaranteed line 
for smtp outbound (smtp inbound, navigation, etc uses another line).
the smpt VS is configured with the defaults: 1000 connections /100 
connections per domain. but acctually we never exceed 50 currant connections. 
so this limits should be fine.

regards Mike


"John Oliver, Jr. [MVP]" wrote:

> This could be ISP related or Exchange or Firewall configuration related. 
> What type of WAN connection do you have?  As for Exchange config, check your 
> SMTP VS Delivery Tab- Outbound Connections to insure your not limited by the 
> number you are sending.  Check your Firewall for any restrictions regarding 
> SMTP outbound.
> 
> -- 
> John Oliver, Jr
> MCSE, MCT, CCNA
> Exchange MVP 2008
> Microsoft Certified Partner
> 
> 
> "freytshy"  wrote in message 
> news:FE1A8128-0F2E-4AE4-8743-09635DEC7472@microsoft.com...
> > hello out there.
> > i'm trying to track down problems with outbound mail transfer. When our
> > server (2k3 server/ex 2k3 sp2) is confronted with big load of mails he
> > completely stops sending outbound mail.
> > for my research i'd need some information about the following:
> > I'm using perfmon: does smtp-messages sent total count a mail to x
> > recipients as one mail or as x mails?
> > is it a normal average to have 5% of smtp-outbound_connections_total 
> > droped
> > (smtp-outbound_connection_refused)?
> >
> > thank you in advance 
> 
> 
>
date: Tue, 18 Dec 2007 01:06:03 -0800   author:   freytshy

Re: ex 2k3 smtp outbound connections refused    
dear John
in our org we send about 4500 mails a day, smpt outbound has a dedicated 
10mbps line (all other traffic travels though other lines). 
the smtp VS is configured with the default limits: 1000 connections/100 
connections per domain. and we never exceed more than 50 currant connectios. 
so this limits should be ok.

regards Mike

"John Oliver, Jr. [MVP]" wrote:

> This could be ISP related or Exchange or Firewall configuration related. 
> What type of WAN connection do you have?  As for Exchange config, check your 
> SMTP VS Delivery Tab- Outbound Connections to insure your not limited by the 
> number you are sending.  Check your Firewall for any restrictions regarding 
> SMTP outbound.
> 
> -- 
> John Oliver, Jr
> MCSE, MCT, CCNA
> Exchange MVP 2008
> Microsoft Certified Partner
> 
> 
> "freytshy"  wrote in message 
> news:FE1A8128-0F2E-4AE4-8743-09635DEC7472@microsoft.com...
> > hello out there.
> > i'm trying to track down problems with outbound mail transfer. When our
> > server (2k3 server/ex 2k3 sp2) is confronted with big load of mails he
> > completely stops sending outbound mail.
> > for my research i'd need some information about the following:
> > I'm using perfmon: does smtp-messages sent total count a mail to x
> > recipients as one mail or as x mails?
> > is it a normal average to have 5% of smtp-outbound_connections_total 
> > droped
> > (smtp-outbound_connection_refused)?
> >
> > thank you in advance 
> 
> 
>
date: Tue, 18 Dec 2007 01:12:00 -0800   author:   freytshy

Re: ex 2k3 smtp outbound connections refused    
Have you checked with your ISP to see if they may be blocking SMTP for any 
reason?  Check your Firewall, very possible its limiting the number of SMTP 
connections outbound.  You can also turn on Message Tracking to see exactly 
where the messages are getting hung.

-- 
John Oliver, Jr
MCSE, MCT, CCNA
Exchange MVP 2008
Microsoft Certified Partner


"freytshy"  wrote in message 
news:126C397A-1039-4183-A635-5ED52DDAC1EE@microsoft.com...
> dear John
> in our org we send about 4500 mails a day, smpt outbound has a dedicated
> 10mbps line (all other traffic travels though other lines).
> the smtp VS is configured with the default limits: 1000 connections/100
> connections per domain. and we never exceed more than 50 currant 
> connectios.
> so this limits should be ok.
>
> regards Mike
>
> "John Oliver, Jr. [MVP]" wrote:
>
>> This could be ISP related or Exchange or Firewall configuration related.
>> What type of WAN connection do you have?  As for Exchange config, check 
>> your
>> SMTP VS Delivery Tab- Outbound Connections to insure your not limited by 
>> the
>> number you are sending.  Check your Firewall for any restrictions 
>> regarding
>> SMTP outbound.
>>
>> -- 
>> John Oliver, Jr
>> MCSE, MCT, CCNA
>> Exchange MVP 2008
>> Microsoft Certified Partner
>>
>>
>> "freytshy"  wrote in message
>> news:FE1A8128-0F2E-4AE4-8743-09635DEC7472@microsoft.com...
>> > hello out there.
>> > i'm trying to track down problems with outbound mail transfer. When our
>> > server (2k3 server/ex 2k3 sp2) is confronted with big load of mails he
>> > completely stops sending outbound mail.
>> > for my research i'd need some information about the following:
>> > I'm using perfmon: does smtp-messages sent total count a mail to x
>> > recipients as one mail or as x mails?
>> > is it a normal average to have 5% of smtp-outbound_connections_total
>> > droped
>> > (smtp-outbound_connection_refused)?
>> >
>> > thank you in advance
>>
>>
>>
date: Tue, 18 Dec 2007 21:48:24 -0500   author:   John Oliver, Jr. [MVP]

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