pop3 randomly fails with error 0x800ccc0e

[delanitaldia]

Hello,

I have some troubles with the outlook's clients of my office.

I am the postmaster of our organization and there are some people that
can not receive mail. The error prompted is 0x800ccc0e. This error is
not persistent, it crashes randomly but when it crashes, the only
solution is to restart oulook and an then all seems to work properly.

I made a tcpdump from our mail server, and it seems that outlook
doesn't send the ack after the sync's packets.


--- failing trace ---
09:20:54.958940 <outlook_client>.1433 > <mail_server>.110: S
4215431891:4215431891(0) win 65535 <mss 1460,nop,nop,sackOK> (DF)
09:20:54.958965 <mail_server>.110 > <outlook_client>.1433: S
1216714153:1216714153(0) ack 4215431892 win 5840 <mss
1460,nop,nop,sackOK> (DF)
09:20:58.213783 <outlook_client>.1433 > <mail_server>.110: S
4215431891:4215431891(0) win 65535 <mss 1460,nop,nop,sackOK> (DF)
09:20:58.213803 <mail_server>.110 > <outlook_client>.1433: S
1216714153:1216714153(0) ack 4215431892 win 5840 <mss
1460,nop,nop,sackOK> (DF)
09:20:58.223869 <mail_server>.110 > <outlook_client>.1433: S
1216714153:1216714153(0) ack 4215431892 win 5840 <mss
1460,nop,nop,sackOK> (DF)
09:21:04.223871 <mail_server>.110 > <outlook_client>.1433: S
1216714153:1216714153(0) ack 4215431892 win 5840 <mss
1460,nop,nop,sackOK> (DF)
09:21:04.776113 <outlook_client>.1433 > <mail_server>.110: S
4215431891:4215431891(0) win 65535 <mss 1460,nop,nop,sackOK> (DF)
09:21:04.776131 <mail_server>.110 > <outlook_client>.1433: S
1216714153:1216714153(0) ack 4215431892 win 5840 <mss
1460,nop,nop,sackOK> (DF)
09:21:16.223874 <mail_server>.110 > <outlook_client>.1433: S
1216714153:1216714153(0) ack 4215431892 win 5840 <mss
1460,nop,nop,sackOK> (DF)


-- Working trace ----

11:24:41.853609 <outlook_client>.2246 > <mail_server>.110: S
2516412188:2516412188(0) win 16384 <mss 1460,nop,nop,sackOK> (DF)
11:24:41.853627 <mail_server>.110 > <outlook_client>.2246: S
442299450:442299450(0) ack 2516412189 win 5840 <mss
1460,nop,nop,sackOK> (DF)

11:24:41.853838 <outlook_client>.2246 > <mail_server>.110: . ack 1 win
17520 (DF)

/\/\ this ack

11:24:41.857748 <mail_server>.110 > <outlook_client>.2246: P 1:94(93)
ack 1 win 5840 (DF)
11:24:41.858297 <outlook_client>.2246 > <mail_server>.110: P 1:14(13)
ack 94 win 17427 (DF)
11:24:41.858335 <mail_server>.110 > <outlook_client>.2246: . ack 14
win 5840 (DF)
11:24:41.858996 <mail_server>.110 > <outlook_client>.2246: P
94:129(35) ack 14 win 5840 (DF)
11:24:41.859759 <outlook_client>.2246 > <mail_server>.110: P 14:29(15)
ack 129 win 17392 (DF)
11:24:41.862384 <mail_server>.110 > <outlook_client>.2246: P
129:188(59) ack 29 win 5840 (DF)
11:24:41.862765 <outlook_client>.2246 > <mail_server>.110: P 29:35(6)
ack 188 win 17333 (DF)
11:24:41.862800 <mail_server>.110 > <outlook_client>.2246: P
188:197(9) ack 35 win 5840 (DF)
11:24:41.863179 <outlook_client>.2246 > <mail_server>.110: P 35:41(6)
ack 197 win 17324 (DF)
11:24:41.863285 <mail_server>.110 > <outlook_client>.2246: P
197:245(48) ack 41 win 5840 (DF)
11:24:41.863536 <mail_server>.110 > <outlook_client>.2246: F
245:245(0) ack 41 win 5840 (DF)
11:24:41.863654 <outlook_client>.2246 > <mail_server>.110: F 41:41(0)
ack 245 win 17276 (DF)
11:24:41.863665 <mail_server>.110 > <outlook_client>.2246: . ack 42
win 5840 (DF)
11:24:41.863764 <outlook_client>.2246 > <mail_server>.110: . ack 246
win 17276 (


Do you know what is happening?

Thanks in advance,

Opsss, could you please reply at gforns(at)gmail(dot)com?

Best regards,

--Gerard