Windows DatabaseebooksStatistical Information

LWE10102 : Howto know a certain port is open, used and listening on a windows system

Symptom:

You need to connect to a certain server and port but you are not shure the server is listening

Cause:

You can use this test to make shure the server is listening

Solution:

Windows has a very nice port query command. (portqry) Portqry enables you to test a port and its status.

portqry -n lubbysrv -p tcp -e 135
Querying target system called:
lubbysrv
Attempting to resolve name to IP address...
Name resolved to 192.168.123.13
TCP port 135 (epmap service): LISTENING
Querying Endpoint Mapper Database...
Server’s response:

UUID: a4f1db00-ca47-1067-b31f-00dd010662da
Exchange 2003 Server STORE EMSMDB Interface
ncacn_http:192.168.123.6[6001]

Here are a few more examples:

portqry -n myserver.com -e 25
portqry -n 10.0.0.1 -e 53 -p UDP -i
portqry -n host1.dev.reskit.com -r 21:445
portqry -n 10.0.0.1 -o 25,445,1024 -p both


portqry -n lubbyex1 -e 25

Querying target system called:
lubby1-ex1

Attempting to resolve name to IP address...

Name resolved to 192.168.123.40

TCP port 25 (smtp service): LISTENING

Data returned from port:
220 lubby1-ex1.lubby.test Microsoft ESMTP MAIL Service, Version: 6.0.3790.3959
ready at  Mon, 17 Mar 2008 16:03:30 +0100


portqry -n TSE01 -e 1494

Querying target system called:

 TSE01

Attempting to resolve name to IP address...

Name resolved to 192.168.123.100


TCP port 1494 (unknown service): LISTENING

Here we check if RDP is active:

portqry -n DC01 -e 3389

Querying target system called:

 DC01

Attempting to resolve name to IP address...

Name resolved to 192.168.123.10


TCP port 3389 (sapgw89 service): LISTENING

Disclaimer:

The information provided in this document is intended for your information only. Lubby makes no claims to the validity of this information. Use of this information is at own risk!
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