Hi there screaminediot, and welcome to the forums!
This sounds to me like it could be network issuesā¦
Im not saying that it IS, just that it sounds like that to me, and i have no official role here on the forum.
I would test the uplink (internet connection) on both computers, making sure to check bandwidth (transfer speeds in both directions) and latency (message reply lag) with a network tester (like speedtest.net).
A websearch gave me the following numbers for comparison, apparently this is āminimum requirementsā in general, and not specific to Generation Zero.
For FPS-games: 30 Mbps (Down) 1 Mbps (Up) 15 ms (latency)
For the host, the 1 Mbps (Up) speed seems quite low and may not be sufficient.
This could, at least in theory, also be a NAT/firewall-issue, or even one of your ISPĀ“s not allowing incoming traffic or a specific port range or whatnot.
But that seems to me a bit unlikely as it would probably cause more obvious failures than the ones you describe and steam is supposed to handle those network types too.
I have had some issues connecting to some players over the years, often i could host the game and have my friends connect to me (my uplink is quite good), but we could rarely connect to a few individuals (dsl uplinks and from another part of the world), they had to connect to us for MP to work.
My sonĀ“s āgamingā-rig (at the time) was severely underpowered, but on the same uplink as me, and his hosted sessions were rarely stable but we could connect, most of the timeā¦
The most logical conclusion is that hosting players with weak uplink cant output enough data to all the clients in time, creating odd sync errors, players not able to see each other and so on.
Or if the link is really bad, not able to even create the MP-connection between host and client(s).
What kind of uplink are you folks using?
And as this can apparently happen to underpowered computers too, then it seems reasonable to ask you, are the computer specs meeting minimum requirements?
For reference:
PC Minimum Requirements:
OS: 64bit - Windows 7 Service Pack 1
Processor: Intel i5 Quad Core
Memory: 8 GB RAM
Graphics: nVidia GTX 660 / ATI HD7870 - 2 GB VRAM / Intel Iris Pro Graphics 580
Storage: 35 GB available space
PC Recommended Specs:
OS: 64bit - Windows 10
Processor: Intel i7 Quad Core
Memory: 16 GB RAM
Graphics: nVidia GTX 960 / R9 280 - 4 GB VRAM
Storage: 35 GB available space