HTTP request sent, awaiting response ... 404 Not Found

background:

One day in the data Escalation task, appears: "HTTP request sent, awaiting response ... 404 Not Found "exception.
The log is as follows:
Task id:xxxx start execution, execute command: edw/etl/xx.py 125_yyyymmdd_done.txt wireless_order_deal_5min
--2015-02-27 08:56:09--Http://172.xx.xx.xx/wireless_order_deal_5min/125_20150226_done.txt
Connecting to 172.xx.xx.xx:80 ... Connected.
HTTP request sent, awaiting response ... 404 Not Found
2015-02-27 08:56:09 ERROR 404:not Found.

A, through the Fortress machine query results are as follows:

Preliminary judgment, the other side (b) of the file does not exist or service abnormalities.

Problem feedback to B, b through the Fortress machine query results are as follows:

The other side feedback the local all normal.

Problem Analysis:

Such cases may be caused by service changes, configuration files, networks, and so on.

Solution:

Finally, the Nginx service that locates to the other side (b) is stopped by mistake, and then the problem is solved after the service restart Nginx.