I will be building a server/client software on Windows, where many machines need to communicate with a Postresql database running on the server. This is C++ software so I will use libpq to connect to the database.
If I do this, will there be issues with the firewall? I'd like to make configuration as easy as possible and not have users open up firewall ports or disable their firewall.
If I do need to open up firewall ports, can I use WCF to get around the issue? Basically send a command to the server using WCF, run the postgresql command locally, and get the result back (I have never used WCF but understand that it can communication using HTTP port 80).
PostgreSQL typically listens on port 5432, which is not open by default in the Windows firewall. But the only machine where the firewall would need to be re-configured is the one where PostgreSQL is running. If you have many client machines, none of them should require firewall changes (unless they have restrictions on outbound traffic, which is rare).
Hope this helps.
You can also configure SSL connections to ensure better security.
Related
On a Windows machine, I need two apps (specifically, IIS and OpenVPN) to make use of port 443 simultaneously. I know it can be done in Linux, but is there a way to do that in Windows?
Here is what I have tried:
I tried TCP port split software, but it did not work out for me.
I tried using .net port sharing, but that seems limited to WCF apps and will not work in my scenario.
Tried to find ways to separate HTTP traffic from anything else, and send those to OpenVPN (but could not find any good apps for that so far).
In short, how can this be solved? For instance, could we write a WCF application that would forward traffic to OpenVPN and IIS?
I have a .net core app that when runs, spins up a grpc server to listen for inbound network connections. Firewall allows .netcore app to run and listen for connections, but it doesn't allow grpc server to bind to any port. Even though I added a rule for the port in question to allow connections, I still can't get it to work. For other applications, firewall prompts me if I want to allow access to certain app, but for this case I don't get any prompt. How can I allow access to server that runs a server?
I wasted 2 days on this and finally got the answer. Windows update caused certain valid to use ports to be excluded and as a result I couldn't run any app that listens on those excluded ports.
Here is a link to Microsoft article.
Windows Update blocking ports
We are building php web application while i am a designers and my friend is developer we work on different pcs we want to test the file by runnig on localhost on both of our pc how can we reach it. I have gone through some of concepts in internet but didn't get proper info.
Yes. You need to create a firewall rule to allow access through whatever port you are serving on, probably 8080.
Here is how to create an inbound port rule in windows
Then they should be able to access your server by simply using your ip
I am trying to set up my JMeter master/slave set up on AWS EC2 instances using windows. Out of the box integration didn't work (connection refused errors) and after some investigation I got to know that RMI communication only works if the machines are on same subnet (is this true?). I found this great article and I tried to follow it as is on windows (tried running ssh port forward tunneling via cygwin) but not have any luck. So I was hoping if someone already done this with Windows and can share their experience.
Out of the box integration didn't work (connection refused errors) and
after some investigation I got to know that RMI communication only
works if the machines are on same subnet (is this true?)
It is not necessary. Even if the machines are in a different subnet and addressable via the network, RMI should work. Here make sure the Security Groups and NACLs are properly set so that both EC2 instances can communicate with each other via the network.
You can check whether you can ping(For this you need to enable ICMP in your Security Groups and also make sure other needed ports are opened for RMI) from one EC2 instance to another. If the servers can communicate with each other, then you need to troubleshoot internal firewall configuration in windows EC2 instances.
We have used https://testable.io/ AMI's from the marketplace. It takes care of all configuration and just needs to worry only about testing and the results.
https://aws.amazon.com/marketplace/pp/B073JNTVKP
All our endpoints are secured to certain IP-ranges from testable.io. If you have internal, still you need to setup those security settings.
Hope it helps.
I have a client who is remote. I need to debug some weird problem that none of my other clients are having. Before I try and set up a conference with this client, I would like to know if there is some way of remotely debugging our application.
I see that there are remote debugging tools available for Visual Studio, but from what I've read, I need to be on the same subnet. As the person is remote, this is not a possibility. Also, as I'd like to keep our connection secure, I would need to connect up some sort of encrypted tunnel (this is where I'm a little fuzzy as my networking skills are mostly theoretical).
As I understand it, an encrypted tunnel is a bridge to another (different) subnet. This is to ensure that those computers on the other side won't interfere with the local subnet computers.
So, because the client's computer is on a different subnet, I think that this is not possible. Or is it? Should there not be a way of making the client's computer show up as a virtual computer on my subnet, by forwarding packets from one subnet to another? I would think that this is theoretically possible, but I'm not exactly sure how I would go about this.
Also, at the moment, my current way that we connect to clients is through GoToMeeting, but I don't think that it supports tunneling. If not, then I may need some way of generating a tunnel, so I was also thinking of maybe using some SSH programme like PuTTY.
As I have said before, my knowledge of networking is quite theoretical, so if the tools that I am suggesting are not the correct ones, please correct me. (I'm a programmer, damm it! Not a network engineer!)
Both computers are Windows boxes. Windows 10 (client) and Windows 8.1 (development).
If you can connect to an ssh server in the remote network, you can (subject to configuration on the server) create a tunnel such that you connect to a socket on your local pic and the connection appears from the server to an endpoint on the remote network.
You'll want to investigate the -L command of OpenSSH, which combined with the PuTTY docs, should help explain what's required.
By default, the endpoint would be a port on the ssh server, but it could be a port on a different host that the remote server can connect to.
I'm not familiar with the current state of Windows SSH servers, but even if there isn't a system server to hand, you should be able to have on run 'on demand' - if you run it on a non-privileged port and by the user you want to connect in as, it shouldn't even need Admin privileges.
I'm not familiar with GoToMeeting, but the one thing with SSH tunnelling it that IT depts should be familiar with SSH. If trying that, focus on getting a working connection in, then setting up the tunnel, then connecting through it as separate steps.
Once you have an SSH connection, then it doesn't need to do something itself, and you can then investigate connecting while specifying the port forwarding, but will will need to get the basic connection working correctly first.