[Mimedefang] md_check_against_smtp_server() returned an empty response

[Richard Laager]

This is unrelated to the other thread.

I'm troubleshooting an issue where md_check_against_smtp_server()
intermittently hangs for 5 minutes. It's *always* 300 seconds exactly
(ignoring sub-second precision).

The error is always the returned an empty response from
get_smtp_return_code().

I'm using this function for doing callbacks against the sender's
address. I look up the MX records using Net::DNS. Before you hate me too
much, I cache positive responses for 7 days and negative responses for 1
hour. The delays discussed above are around the actual
md_check_against_smtp_server() call and *nothing else*. To get this far,
I had to instrument my filter with logging before and after every
non-trivial block of code.

Does anyone have any idea why the 15 second IO::Socket::INET timeout
isn't applying in these cases?

Thanks,
Richard


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Re: [Mimedefang] md_check_against_smtp_server() returned an empty response

[Steffen Kaiser]

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Hash: SHA1

On Wed, 27 Mar 2013, Richard Laager wrote:


I'm troubleshooting an issue where md_check_against_smtp_server()
intermittently hangs for 5 minutes. It's *always* 300 seconds exactly
(ignoring sub-second precision).

I'm using this function for doing callbacks against the sender's
address. I look up the MX records using Net::DNS. Before you hate me too


:-|


Does anyone have any idea why the 15 second IO::Socket::INET timeout
isn't applying in these cases?


tar-pitting? IMHO, the timeout kicks in when there are no TCP alive 
packets. But when the other partner sends keep alive packets, but does not 
respond simply.


- -- 
Steffen Kaiser

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