On 05/06/2018 12:19, Geoff Winkless wrote:
On Tue, 5 Jun 2018 at 08:17, Neil Price <nprice@xxxxxxxxxx> wrote:
I can not see anything the account setup that can cause this, suggestions?
Running behind an overly-aggressive TCP proxy?
There is no proxy involved. They are all on the same physical network.
What does tcpdump/wireshark show?
What am I looking for? The only thing I see which is relevant after a
mail has been sent is
12:56:23.475625 IP (tos 0x0, ttl 64, id 34941, offset 0, flags [DF],
proto TCP (6), length 82)
ctgw-3.ad.gibb.co.za.imap2 > 192.168.102.228.61763: Flags [P.],
cksum 0x4cb5 (incorrect -> 0xa2e7), seq 20:62, ack 19, win 229, length 42
12:56:23.475680 IP (tos 0x0, ttl 64, id 34942, offset 0, flags [DF],
proto TCP (6), length 40)
ctgw-3.ad.gibb.co.za.imap2 > 192.168.102.228.61763: Flags [F.],
cksum 0x4c8b (incorrect -> 0x1866), seq 62, ack 19, win 229, length 0
12:56:23.475911 IP (tos 0x0, ttl 127, id 3446, offset 0, flags [DF],
proto TCP (6), length 40)
192.168.102.228.61763 > ctgw-3.ad.gibb.co.za.imap2: Flags [.],
cksum 0x1148 (correct), seq 19, ack 63, win 2051, length 0
12:56:23.476233 IP (tos 0x0, ttl 127, id 3447, offset 0, flags [DF],
proto TCP (6), length 40)
192.168.102.228.61763 > ctgw-3.ad.gibb.co.za.imap2: Flags [F.],
cksum 0x1147 (correct), seq 19, ack 63, win 2051, length 0
12:56:23.476256 IP (tos 0x0, ttl 64, id 6556, offset 0, flags [DF],
proto TCP (6), length 40)
ctgw-3.ad.gibb.co.za.imap2 > 192.168.102.228.61763: Flags [.],
cksum 0x1865 (correct), seq 63, ack 20, win 229, length 0
12:56:23.915208 IP (tos 0x0, ttl 63, id 21520, offset 0, flags [DF],
proto TCP (6), length 52)
192.168.102.146.58600 > ctgw-3.ad.gibb.co.za.8008: Flags [.], cksum
0xea47 (correct), seq 1364296473, ack 954946665, win 245, options
[nop,nop,TS val 1683933952 ecr
12:56:23.915224 IP (tos 0x0, ttl 64, id 965, offset 0, flags [DF], proto
TCP (6), length 52)
where ctgw-3.ad.gibb.co.za is the cyrus server and 192.168.102.228 is
currently the misbehaving client.
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