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slow emails

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slow emails - 20.Jan.2006 5:12:51 PM   
amerch1

 

Posts: 5
Joined: 20.Jan.2006
Status: offline
 
Dear members,

We just installed ISA Server 2004 recently. Everything is working fine except when we are sending out emails.
Before the server install, we could send out emails from Eudora or Outlook in 2 seconds. But now, it takes 30-40 seconds to send out emails. It shouldn't take that long, should it?
A couple of things that I have tried:
1.) I moved the SMTP rule to number 1. This is the first rule in the firewall policies.
2.) I unchecked the SMTP filtering check box.

Is there anything else I can try to speed this up. I will appreciate any help in advance! It sucks if it takes that long to send out emails.

Thanks!

--Aasim.
Post #: 1
RE: slow emails - 20.Jan.2006 8:03:32 PM   
spouseele

 

Posts: 12830
Joined: 1.Jun.2001
From: Belgium
Status: offline
Hi Aasim,

please, tell us something more about your configuration:

  • is each mail client connecting to an external mail server?
  • what rule have you exactly in place?
  • how are the clients configured?
  • can they resolve external FQDN's?
  • ...


HTH,
Stefaan

(in reply to amerch1)
Post #: 2
RE: slow emails - 20.Jan.2006 9:38:17 PM   
amerch1

 

Posts: 5
Joined: 20.Jan.2006
Status: offline
 
Hi Stefaan,

I am running ISA server 2004 on Windows Server 2003. Each email client is connecting to an external
email server. The rule that I have in place is to allow all users to use the following selected protocols: IMAP4, IMAP5, SMTP, POP3, NNTP, LDAP, from Internal, Localhost to External.

The network configuration is an edge firewall. The clients are running Windows 2000 Professional. I tried a few other things. I turned off all logging just to see if it made a difference. It still takes long to send out emails.

TIA

--Aasim.

(in reply to spouseele)
Post #: 3
RE: slow emails - 20.Jan.2006 9:55:45 PM   
spouseele

 

Posts: 12830
Joined: 1.Jun.2001
From: Belgium
Status: offline
Hi Aasim,

Ok, that's already some info, but you didn't answer all my questions yet!

  • how are the clients configured? I mean, are they configured as a Firewall or Securenat client?
  • can they resolve external FQDN's? Can you nslookup the FQDN of the external mail server on the client?


    HTH,
    Stefaan

    (in reply to amerch1)
  • Post #: 4
    RE: slow emails - 20.Jan.2006 10:09:16 PM   
    amerch1

     

    Posts: 5
    Joined: 20.Jan.2006
    Status: offline
     
    Hi Stefaan,

    The clients are configured as secure NAT clients.

    Yes! they can resolve external FQDN's. I just did a nslookup of the FQDN of the external mail server and I got a response. It seems to work.

    What I don't understand is that it takes about 40 seconds after I click on the "Send" button in Eudora to
    send out the message? This just happens when I use Eudora.

    When I am using a web-based email program like Yahoo or Hotmail, that works fine.

    TIA.

    --Aasim.


    (in reply to amerch1)
    Post #: 5
    RE: slow emails - 20.Jan.2006 10:48:43 PM   
    spouseele

     

    Posts: 12830
    Joined: 1.Jun.2001
    From: Belgium
    Status: offline
    Hi Aasim,

    OK, I'm glad to hear that the name resolving is not the culprit!

    Assuming that Eudora uses the SMTP protocol to send out the mails, please try the following command in a command box on the client:

    telnet FQDN 25

    where FQDN is the FQDN or IP address of the mail server.

    Does this connection succeed rapidly or do you see the same delay?

    BTW --- how is  HKLM\System\CurrentControlSet\Services\Tcpip\Parameters\EnablePMTUDiscovery configured on ISA server?

    HTH,
    Stefaan

    (in reply to amerch1)
    Post #: 6
    RE: slow emails - 23.Jan.2006 9:48:22 PM   
    amerch1

     

    Posts: 5
    Joined: 20.Jan.2006
    Status: offline
    Hi Stefaan,

    I tried telnetting the smtp server. I see the same delay until a response is sent back to me.
    The telnet response delay is the same as the one I see through Eudora.

    The value of the "HKLM\System\CurrentControlSet\Services\Tcpip\Parameters\EnablePMTUDiscovery" key was 0.
    We changed it to 1.

    After changing the value, we restarted the ISA server and tried again. It doesn't seem to make any difference.
    We are seeing the same time delay.

    I will appreciate any other suggestions!

    TIA,

    Sincerely,

    --Aasim.

    (in reply to spouseele)
    Post #: 7
    RE: slow emails - 23.Jan.2006 11:42:30 PM   
    spouseele

     

    Posts: 12830
    Joined: 1.Jun.2001
    From: Belgium
    Status: offline
    Hi Aasim,

    did you try the telnet command with both a FQDN and an IP address on the client?

    Because your rule apply from Internal and Localhost (that means ISA itself), what's the result of the telnet command on ISA itself, again with a FQDN and an IP address?

    Are there some Alerts or Event messages on the ISA box?

    Do you see something strange in the ISA log?

    If the above doesn't reveal something, we'll need the details of the ISA box. That means 'ipconfig /all' and 'route print' to start with.

    HTH,
    Stefaan

    (in reply to amerch1)
    Post #: 8
    RE: slow emails - 30.Jan.2006 6:56:40 PM   
    amerch1

     

    Posts: 5
    Joined: 20.Jan.2006
    Status: offline
     
    Stefaan,

    We solved this problem by opening up Port 113 in our firewall. We named it identd.

    I do appreciate your time and your timely responses.

    Thanks!

    --Aasim.


    (in reply to spouseele)
    Post #: 9
    RE: slow emails - 30.Jan.2006 8:03:49 PM   
    spouseele

     

    Posts: 12830
    Joined: 1.Jun.2001
    From: Belgium
    Status: offline
    Hi Aasim,

    good to hear you have it working and thanks for the follow up!

    Wow... never would have thought that Identd is still used nowadays!  

    Thanks,
    Stefaan

    (in reply to amerch1)
    Post #: 10

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