On 24/03/09 10:28, Marek Podmaka wrote:
During the weekend I re-installed our mail server (sarge 32bit) into lenny 64bit with debian kernel 2.6.26-1-amd64. Everything works, but customers are reporting weird connection issues to postfix. Sometimes it works and sometimes not. Few of them are connected using the same DSL provider, but not all. Mar 24 10:59:19 kenny postfix/smtpd: connect from adsl-dyn113.91-127-26.t-com.sk[126.96.36.199] Mar 24 10:59:19 kenny postfix/smtpd: lost connection after CONNECT from adsl-dyn113.91-127-26.t-com.sk[188.8.131.52] Mar 24 10:59:19 kenny postfix/smtpd: disconnect from adsl-dyn113.91-127-26.t-com.sk[184.108.40.206] <snip>
I'm sure I read that in the newer kernel that Lenny has, there is more aggressive scaling of incorrect TCP windows or something like that. I'm trying to find where I read it, but can't at the moment, however perhaps this could be the issue?
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