I have some services running on my PC at home. It is behind a router, so it has a local ip, like 192.168.*.*. My router is registered at no-ip.com, so hopefully
I would like to connect to my pc from my workspace. It is a big company using proxy, so I cannot have direct connection.
Also I would like to have a secure connection.

Do you have any idea to realize it? Should I try VNC, ssh tunnel, or ?.

Generally you just need to set up a port forwarding rule in your home router to redirect any incoming requests on the desired port to the machine's local IP. You can use SSH, VNC, or any other services that listen on a dedicated port.

The network setup at your office typically doesn't matter unless you're trying to connect in reverse (home to work).

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You can install a software, like remotePC, on home PC and office PC. And then your office PC can access your home PC.

Good way to get fired usually.

If the company is smart they disabled almost everything. I'd consider barracudaserver and use https. Every once in a while they offer it free.

As above you have to learn how to NAT your home modem/router. Some have a build in app that can connect to DDNS services and change dns name to ip when you dynamic ip changes. If not then you'd need a client at home to change no-ip's dns entry. Better to nat the ports to the box instead of that other setting. I forget that name, but it opens all outside ports to the internal lan.

I think the "DMZ" in the NAT+router is supposed to open the box to the internet but my experience was that it didn't seem to work and I ended up forwarding the ports I needed to the machine on the LAN. You also need to reserve an IP address for the machine you'll be connecting to on the router.
One place I worked I couldn't even SSH on port 80 to my home box though (I tried non-standard and default) so ended up giving up and using my phone to connect to home instead.

Thanks. I got old and can't remember shucks! DMZ is what I wanted to print.

I also meant http://barracudadrive.com/HttpsTunnel.lsp

I work at a pretty restricted place. One of the few ways to get out was Adobe's connect now and using https.

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thanks, a lot of things to try. I have a DD-WRT router, so probably I can configure nat/port forwarding or whatever required. Also I have a DDNS account, that works.