Make Opendatacam reachable behind NAT

Thank you for the logs. I have a theory why Opendatacam is not handling your NAT setup correctly. I believe what happens is the following:

1. Opendatacam listens on any IP address/hostname for incoming connections on Port 8080.
2. The first client connecting to <odc>:8080/ or <odc>:8080/start starts the Darknet process (see server.js)
3. Opendatacam then tries to connect to Darknet using the <odc> IP address/hostname from your browser (see Opendatacam.js). This works fine unless you use NAT.
4. Because now Opendatacam tries to connect to Darknet on your public IP/hostname ports 8070 and 8090. However as there are no port forwarding rules setup, the connection will fail.

Therefore, to fix this you we have two options:

1. Setup port forwarding for 8070 and 8090 (not preferred)
2. Fix the Darknet hostname in https://github.com/opendatacam/opendatacam/blob/development/server/Opendatacam.js#L792 and https://github.com/opendatacam/opendatacam/blob/development/server.js#L188 to localhost

_Originally posted by @vsaw in https://github.com/opendatacam/opendatacam/issues/373#issuecomment-779727816_

[zeljkomarinkovic]

It was my fault, tried to install curl on that machine and somehow screwed up mongod.services (i think libcurl is culprit there). Reinstalled mongodb and works just fine. Sorry for all trouble i caused and not checking obvious first

edit:https://askubuntu.com/questions/1063003/how-can-i-install-both-curl-depending-on-libcurl4-and-mongodb-depending-on-li

[vsaw]

Closed via https://github.com/opendatacam/opendatacam/pull/527