电信(抑或是墙娘?)来大姨妈了

经过多天的阴雨连绵后,今天早上的魔都总算有了点太阳。不过,早上起来后发邮件的经历简直比之前的阴雨天还让人抓狂 (/‵Д′)/~ ╧╧

一如既往,我打开Outlook程序准备发邮件,点了“发送”后进度条开始慢慢地跑,然后duang——发送失败,错误“0x80042109”。放狗搜了下,这个基本是和SMTP服务器连线出问题而导致的。我用的outlook.com邮箱加上上海电信时不时来下大姨妈,所以常常会连接不畅。于是我便重试!重试!!重试!!!……经过N次后仍然是错误当空照!

试着traceroute一下貌似没有问题,能trace到国外。

好吧,重病下猛药杀鸡用牛刀,我便打开了Wireshark来抓下包。见下图,
20151211-outlook-smtp-fail

一大堆TCP Retransmission(黑底色),曰了狗了。就算当中有一次成功连上服务器看到欢迎信息就挂了(No. 4857)。可是与此同时,同一个邮箱的IMAP收信正常,除了一如既往的慢。  (╬゚д゚)

本着治病救人承前启后死马当活马医的原则,我试着宽带重新PPPoE拨号看看,因为之前有过一些国外网站间歇性无法访问,通过重新拨号解决。重新拨号后,Yeah,正常了,虽然偶尔还有些不稳定(电信的网络就这样),不过邮件总算发出了(下图)。

话说回来这次问题算是谁的锅呢?电信?墙娘?……
(๑¯∀¯๑)

20151211-outlook-smtp-success-after-redail

Blocked?

Very weird situation these days — my server became inaccessible — randomly.

Literally “random”, like I was able to connecting to my server via IPv4, but unable after several minutes/hours. The trace result shows the connection got blocked before even reach to the China Telecom backbone 202.97.*.* (forgot to take a screenshot). Luckily, my server has IPv6 and I’m using 6in4 tunnel provided by HE, so It’s still reachable via IPv6.

And after some trying, I found the server became accessible via IPv4 after my WAN IP address changed  (I’m using a PPPoE broadband, IP address changes when re-dail), but may became inaccessible later.

Final thoughts:

I thought, this problem might be caused by my ISP which said before they were planning to expand their capacity.

Another thought, the Great F**king FireWall is upgrading or testing new features?
(>_<)

 

Movin’ on up, to the Upwork

I’ve been working as a part-time freelancer on Elance for about one year. This year has been a lot of firsts for me — got my first part-time job on that platform, received first payment from there, got cheated by a scam client. Anyway, the experience I’ve got through this year is a lot. A life without dealing with cheater is not a real life. Continue reading Movin’ on up, to the Upwork