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How to run TCP Sockets application from different computers

I would appreciate if someone could help.
I have written a Client/Server Sockets application. The client is Windows Forms C# app and the server is a C# console app which runs locally. The client application has a login form containing the field with generated port.
When user logins he is connecting to the server using that port and the server continues listening incoming connections.
Everything works fine when I test my application simply running several instances of Visual Studio project on one PC. Now, I would like to test it on several PCs and I am very confused here.
I would be grateful if someone could explain in simle words how to run my app on two machines.
How do both users connect to the same server? Where should it be located? Should the server have one IP and different ports per one users group?
Also, my application uses SQL Server Database which is installed locally on one PC. So the application uses connection string with that PC Name. In case of two PCs is it possible to connect the second computer to DB on first PC?
I am sorry if this sounds silly :)
Thanks a lot

So if I am correct you are wondering the following three things?
Q1. How do I test my software in a multiple machine environment.
A: This is perhaps not really a Stackoverflow question but what I would do in this case is to have a small setup in Hyper-V with several machines with different operating systems that all have a shared folder that I can deploy my code to. Of course for more extended testing you would need to get more machines and copy the executables to that machine for testing for the first stage and perhaps write a setup software for the second stage of testing, but that depends on the how much testing you actually do.
Q2. How to I allow several users to connect to my service?
A: I think that Anthony Horne has a great answer to this in the comments - Tell your service to listen on port X and when a client tries to connect open a new communication instance on port Y and ask the client to call back to that port. This is as far as I know industry standard for solving this type of problem.
Q3. My application uses a SQL Server Database can I allow clients to connect to it remotely.
A: Yes you can. Please see this Stackoverflow question.

Remote database connectivity in C#

I have a windows tablet application which store some data from the users. Now i need to send this data to a server via Internet. What all options are there for me to try?? I think syncng the server and client database wont do good since multiple tablets are getting connected to the server.

I think syncng the server and client database wont do good since multiple tablets are getting connected to the server.
Why do you think that? How do you think web servers work? Databases can easily handle multiple connections.
You can either directly connect to the db server, if it supports remote connections, or you can create a webservice and communicate with db via that. Either way, be sure to set the permissions right, otherwise you might have a serious security problem.
// edit to address concerns in the comments
If you want to use a direct connection, you connect to a database exactly the same way as if it was on the same machine. How do you connect to that CE db?? You just need to alter the connection string, but everything else stays the same.
If you want to use a webservice for parsing and communicating with the database, the things get a bit more complicated, but it's still fairly simple. Search the google (or SO) how to use a webservice and how to create one. There are plenty of examples and tutorials out there. It's impossible to cover it all in here I'm afraid.

communication between two emulators through server pc as middle man

i want to built an application which is communication network between two emulator. i have already connect emulator with server.
Now i want to connect two emulators through server(C#) which is PC. like we sent sms through mobile networks.
I need guidance to start this.

I am not sure what your requirements are and how far you would go to implement best practices, however, here are some points to consider based on my experience on a similar application, just to make it clear we worked on a solution where many Android phones would connect to a server to send/receive data.
Web Service is the way to go, this is what web services are meant for, we created WCF based APIs for the applications connecting to the server.
You are working on a heterogeneous system Java on Android, C# on the Server, consider creating REST based APIs on the server for data transfer
Go through these to get a feel of what needs to be done onthe server...
http://www.codeproject.com/Articles/105273/Create-RESTful-WCF-Service-API-Step-By-Step-Guide
http://msdn.microsoft.com/en-us/library/dd203052.aspx
And this for what needs to be done at Android side...
http://docs.xamarin.com/android/tutorials/consuming_web_services
hope that helps....

Best way to contact Desktop application remotely via Internet

I want to pass certain parameters to a desktop application remotely via the internet. I don't want my application to contact the server repeatedly, because many such applications can bring the server down easily. Is there a way to initiate the connection from the server? How can I identify the applications, as there will many of them running on many computers somewhere around the globe. I don't know where to start - I'm trying to do this in C# and ASP.NET/PHP on the server-side. Please give some advice.

Is there a way to initiate the connection from the server?
No. Not without having the client contact with the server first, informing it with the IP address, port to use etc... Which the server will need to keep for each client, hoping that they don't change (or get updated when they do change).
Long polling by the client is the right solution for what you are doing, even if you don't want to use it.

There are many different ways you could approach this, just thinking out of the box, both your app and the server could utilize a different mechanism for transferring the settings. I'm not recommending any of these methods, please don't shoot me down, they are all just ideas.
As an example, your server could connect out using FTP and output the updated settings to an FTP server on each PC. You could install something like Filezilla on each machine which runs your app. You'd obviously need to configure port forwarding on the router to allow the server FTP access.
You could use email. Setting up an email account where your server can login to send out the settings. Your app could possibly login to the same email account possibly even a single Gmail account to retrieve the settings.
Another idea would be to use a file sharing service like Dropbox, Google Drive or similar and where the settings could be shared. Obviously this would involve learning any API and I'm not sure if there are any restrictions on this approach.
The last idea and probably my preferred approach would be to host a web service and database on a remote server, both your server and the applications would connect to the same service to transfer the settings. This approach is obviously firewall/router friendly as all the clients connect out to the web service to collect the required data.
Hope this helps?

Consuming Asp.net web service from remote computer

I create Asp.net WS and host it on the IIS.Now i want to consume it from remote computer or another computer.When i insert the URL of the WS on the remote computer an error message appears inside internet explorer browser page says
This program cannot display the web page
i work on Visual studio 2008, windows 7 and the client application is Asp.net website.
i don't know what is the problem??
have i connect the two computers with LAN(make network between them) or just enough each one connect to the internet??

Your computers need to be able to connect to each other.
If they on LAN, then You need to specify LAN address for asp.net WS.
Also check Your firewall for blocking connections, need to be sure that port were IIS hosted is available for connection
If nothing helps, then provide us more information about problem.

Really i don't know what is the problem.When i do the same thing in another computer it runs but on my laptop doesn't run.