[CentOS] Re: slow SMTP-AUTH
ugob at lubik.ca
Wed Jul 25 23:35:58 UTC 2007
Ugo Bellavance wrote:
> Brett Schroeder wrote:
>> Ugo Bellavance wrote:
>>> I installed sendmail on a centos-4 openvz VM. I set up SMTP-AUTH
>>> and when I try to send mail using this server, there is a big delay in
>>> which my e-mail client (Mozilla Thunderbird) just hangs. The server, on
>>> the other hand, is idle at the same time. It does that no matter if I
>>> use no encryption, TLS, or SSL. When the client is 'hung' sendmail, on
>>> the server side haven't logged anything yet for this connection.
>>> Any idea?
>> Since nothing is logged on the server, it sounds like there is a
>> firewall (or
>> other networking problem) in the way. You should use WireShark (or
>> tcpdump) on
>> the client to capture the network traffic.
I disabled the firewall on the server, no luck. I tried sniffing, I see
5.512292 188.8.131.52 -> 184.108.40.206 TCP 17274 > submission [PSH,
ACK] Seq=350 Ack=10923 Win=17461 Len=53
5.512984 220.127.116.11 -> 18.104.22.168 TCP submission > 17274 [PSH,
ACK] Seq=10923 Ack=403 Win=7504 Len=277
5.724172 22.214.171.124 -> 126.96.36.199 TCP 17274 > submission [ACK]
Seq=403 Ack=11200 Win=17184 Len=0
22.884013 188.8.131.52 -> 184.108.40.206 TCP 17274 > submission [PSH,
ACK] Seq=403 Ack=11200 Win=17184 Len=53
22.884918 220.127.116.11 -> 18.104.22.168 TCP submission > 17274 [PSH,
ACK] Seq=11200 Ack=456 Win=7504 Len=85
22.970714 22.214.171.124 -> 126.96.36.199 TLSv1 Application Data
22.971120 188.8.131.52 -> 184.108.40.206 TLSv1 Application Data
(I removed all lines containing SSH or ssh).
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