I have a Windows 2008 R2 server that will need to listen on a particular port (e.g. 1234) in order for an application upgrade to work, but currently the application doesn't have a listener service configured for port 1234.
Our firewall is managed by a third party, but I would like to check in advance that the port 1234 has been opened before I install the update. Is this possible?
I know I can telnet to the server on other listening ports, but as this server has no application listening to 1234 I can't be certain that it is in fact, open. Telnet results are inconsistent when connecting to ports that are apparently listening in netstat.
Is there anything I can do in Powershell or VB for instance, to set up a listener for port 1234 in advance of the upgrade to ensure it will go smoothly?
Many thanks in advance.
Anything that accepts traffic would work.
Run some other service on port 1234 and see if you can connect to that.
Use a network sniffer like WireShark on the server and see if you're getting connection attempts to port 1234.
Install netcat on the server and tell it to listen to port 1234 then connect to that port on the firewall. If it connects, the port is open. (This is really the same as #1 but without an actual service.)
Related
I have a java program that uses SQL queries. The goal is to send them from my home PC to a workstation on a different network elsewhere.
The SQL server is on Windows Server and I opened port 1433 for inbound connections. From that computer, I can successfully ping the port. However, I can't ping the port from the public ip address, only the local (192.168...), so it doesn't work if I were to try to ping it from my home computer.
Is there a way that I can ping it from my home computer? If so, how would I specify the address for JDBC?
Thanks!
It sounds like your Windows Server is behind an internet gateway/router. You need to configure the gateway to allow and forward inbound connections to TCP port 1433 to the IP of the computer that has SQL Server installed.
Here are some guides that explain how to enable port forwarding on different devices:
How to Forward Ports on Your Router (lifewire.com)
How to Port Forward (No-IP.com)
Also, note that we can ping IP addresses, not ports.
I'm trying to use telnet to check if the port of an application is open.
But i'm receiving the following error:
Connecting To 192.168.1.10...Could not open connection to the host, on port 3001: Connect failed
I assume the port is closed, but is it also possible the port is being in use by another program? Hence why i'm not able to test using telnet?
Now if this is the case, how come some ports allow simultaneous connections from clients and some don't?
All ports allow simultaneous connections from clients when some program is listing on that port. Connect failed means that the port is not listening or a firewall interfered.
You can find out if that port is open by using netstat or on Windows tcpview.
I am running a FreeSWITCH server on a public domain. I am able to make call from my browser(WebRTC with sipjs) to the FreeSWITCH server from a direct Internet connection.
I am testing it on a Firewall that allows only TCP on port 443. I am running a separate TURN server. I am trying to connect from my browser by specifying TURN server with credentials. I am unable to make it work. PeerConnection is getting closed.
FreeSWTICH server is NOT behind Firewall
Client(browser) is behind Firewall
TURN server is available
Is there any configuration I have to do either in FreeSWITCH server or in the client end(javascript) to make it work?
You need to open UDP ports, cause signalling will go via WSS and media via UDP ports:
mod_sofia to serve SIP signaling via WSS and media via SRTP/DTLS.
https://www.packtpub.com/books/content/configuring-freeswitch-webrtc
Yes, you can use a TURN server. You will have to configure it to listen on port 443 with TCP, because by default a TURN server listens on port 3478.
However, if the Firewall checks for a TLS connection (i.e. for HTTPS), you will have to configure the TURN server as a TURNS (TURN over TLS).
First of all, i configured port 80 in my modem router which is 192.168.1.1 and in windows firewall, but although when i check it in websites that does my port 80 open or not?
I get this result: it is closed, how to solved it, call internet provider or what? does it have any other solution that u can help me
Please Help
Regards
if your web server is installed/setup behind a router(local) you need to configure your router for port forwarding pointing to your server ip and port.. you can also enable DMZ and set to point to your server local ip address.
http://lifehacker.com/127276/geek-to-live--how-to-access-a-home-server-behind-a-routerfirewall
We recently installed a sonic firewall on our network. We have a SQL 2005 express server that's configured to listen on dynamic ports. In its configuration manager the dynamic port number is set as 1067 with its default port still 1433.
From my understanding we need to have the following ports open for it to work:
Tcp 1433
Tcp 1067
Udp 1434
Problem is we still cannot connect to the server from outside. When we switch off/disconnect the firewall we can can access the server.
This tells me that the SQL server's setup is fine and the that the problem must be some port we are missing on the firewall.
Any ideas?
Issue netstat -an from an MS-DOS command and try to find what are all ports opend as given in the artilce at
http://support.microsoft.com/kb/287932
and configuring SQL 2005 to allow connections at
http://support.microsoft.com/kb/914277
these may help according those articles:
Client-Server Communication Over a Firewall
Setting up a client to communicate to a SQL Server over a firewall is a simple three-step process:
Make SQL Server listen on a specific port on TCP (the default is 1433) or RPC (the default is a random port greater than 1023). You have to cycle the server after this change.
Configure your firewall server to allow traffic on the specific .
Make the client (on the other side of firewall) use the appropriate connection string to talk to the on the server. You can also use the Client Configuration Utility to add an "Advanced" entry with the appropriate Net-Library and connection string.