How to connect client to remote server without VPN | Together Java | Page 1

opaque abyss Mar 1, 2024, 8:10 AM

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I have to host server side of application of my university's server and client should be on my personal machine.

My university provides OpenVPN config to connect to its server so that the server appears as if it was on my local network. I have been able to successfully to connect client and server while using this OpenVPN config.

But I wonder if there is a way to connect client to a remote server? Like if it was a real world scenario, how would client side of application connect to server without a vpn?

I have tried to do it this way:

spice vectorBOT Mar 1, 2024, 8:10 AM

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<@&987246399047479336> please have a look, thanks.

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You can use </chatgpt:1108714622413963314> to ask ChatGPT about your question while you wait for a human to respond.

opaque abyss Mar 1, 2024, 8:12 AM

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/ChatGPT

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/chatgpt

dark drift Mar 1, 2024, 11:54 AM

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if the client doesn't have the vpn the only way is that the server lefts open the communication ports, in a real world scenario tho, the client will need to have the vpn

pearl fog Mar 1, 2024, 1:39 PM

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opaque abyss I have to host server side of application of my university's server and client s...

if the remote server is exposed publically or if you connect to it directly with something like ssh then yeah, no vpn needed

opaque abyss Mar 1, 2024, 1:40 PM

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What does that mean "exposed publicly"?

pearl fog Mar 1, 2024, 1:40 PM

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like

opaque abyss Mar 1, 2024, 1:40 PM

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I can ping it from my pc

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without vpn

pearl fog Mar 1, 2024, 1:40 PM

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google.com

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has servers that are hosted on some ips

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and have some open ports

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and that means you can talk to them

pearl fog Mar 1, 2024, 1:41 PM

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opaque abyss I can ping it from my pc

then what is the vpn for?

opaque abyss Mar 1, 2024, 1:42 PM

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There is public host name that I can ping without vpn, but cannot connect to it for some reason with sockets.

And when I use vpn, I put in its local IP 192.168.10.80 in Socket's constructor and everything works fine

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So, I cannot connect to the server with my java application without vpn

pearl fog Mar 1, 2024, 1:43 PM

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okay

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so

opaque abyss Mar 1, 2024, 1:43 PM

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But I can ping it from console

pearl fog Mar 1, 2024, 1:43 PM

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when you connect, what port do you use?

opaque abyss Mar 1, 2024, 1:43 PM

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I picked 55123 arbitrarily

pearl fog Mar 1, 2024, 1:43 PM

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is that port exposed on your university's server

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try pinging <ip address>:55123

opaque abyss Mar 1, 2024, 1:44 PM

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One sec

pearl fog Mar 1, 2024, 1:44 PM

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or <domain name>:55123 whatever you have

opaque abyss Mar 1, 2024, 1:45 PM

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ah

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Says "Name or service not known"

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So if the port I use was exposed, I would have been able to connect to this server without vpn?

pearl fog Mar 1, 2024, 1:48 PM

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yes

opaque abyss Mar 1, 2024, 1:53 PM

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pearl fog yes

Thanks a lot for the explanation!

#How to connect client to remote server without VPN