If you admin any Windows Server and use tcpview utility, you will see lots of connection attempts to your server’s common connection ports (e.g. Remote Desktop port 3389).
It is a good idea to block connection attempts from foreign countries if you don’t expect to connect from abroad.
http://xxxx.com/CoM1 does not route properly.
I gets a HTTP 404 error.
The Requested URL: /CoM1
It turns out “COM1” is reserved by default. The list of reserved URL include: COM1-9, LPT1-9, AUX, PRT, NUL, CON.
Add “relaxedUrlToFileSystemMapping” attribute to the web.config httpRuntime.
4: <!-- 10/4/2016 HW: relax the Url to FileSystem Mapping so we can use http://xxxx.com/CoM1 . Otherwise, it treats COM1 as the special COM port 1 -->
5: <httpRuntime targetFramework="4.5.1" relaxedUrlToFileSystemMapping="true" />