Stevetrov encountered this desync removing and placing down an EEI on a server. Looks to be an issue with the active entity order. I managed to figure out a way to semi reliably reproduce it. Steps to reproduce 1. Paste the attached blueprint on a new server in the editor 2. Wait until it starts out...

Please provide the log file and what OS, hardware and version of Factorio you're running on for both the server and the client.

I've played with a 970 in 4k. From my experience I had noticeable frame rate drops when zooming all the way out with forests in view or when a lot of biter corpses were visible. Other than that it was fine.

Is the system clock on your server functioning and set to the right date and time?

The dedicated server server mode more or less ignores everything in config.ini expect for the paths so there's nothing useful in there. To make the whitelist work on startup there's 2 requirements, you need to pass --use-server-whitelist on the command line and the whitelist loaded (which defaults t...

I am eagerly awaiting Factorio 2.0 in 2029... not. But really though, game development is slow and you should all know what rushed game development results in by now.

It should not be workarounded (sending credentials without real need, security!), instead that problem should be fixed. User verification is a requirement for a server to be listed on the public server list. Connecting to public servers with user verification enabled requires the client sending the...

TL;DR Pass user verification on the first connection attempt to public servers. What ? When connecting to a server in the public servers list the client first tries to connect without the credentials that prove it's a verified user. But public servers have to have user verification enabled to be li...

I was curious how this graphics option updated on the fly, and tried to make the rendering resolution of lights increase. But no matter how much I switched between 0.25 and 1 at night I couldn't see any difference at all, even after restarting the game. So I started digging and found DrawEngine.cpp:...

And I think you don't understand how nat punching works. But the good news is that it actually functions in 0.16.51, so I've put together this demonstration video for you that shows the ping pong servers does relay nat punch requests contrary to what you're saying, and that this relaying is integral...

Lol what. This packet is from your ping pong server. This is exactly how NatPunchRequest are sent in 0.16.51, and in this version of Factorio nat punching works as you expect it to.

diagram.png This diagram shows for the packet labeled 1. how NatPunchRequest is sent by the client in 0.16.51. When sent in this manner nat punching works. In 1.1.30 NatPunchRequest is not sent unless you first host a game. If NatPunchRequest packets are not sent then nat punching will not work. Na...

I did some testing on how Factorio does NAT punching and this is my results. How it works in 0.16.51: 1. The client sends a NatPunchRequest to a pingpong server with the address of the Factorio server 2. The pingpong server sends a NatPunchRequest to the Factorio server with the address of the Facto...

I've written a Wireshark dissector for Factorio. Pretty useful when looking at packet captures and you want get more information on what's going on. Keep in mind it doesn't decode everything and it errors out on certain inputs, so don't expect to be able see everything with this. You can get it on m...

If the workaround to get NatPunchRequests sent as described in [1.1.30] NatPunchRequest not sent unless a multiplayer game has been hosted first is followed then the server prints the following in the log if started with the --verbose option when the server is selected in the public server list in t...

While looking into NAT punching I noticed the following weird behavior: If you start the game and go directly to the public server list, click on servers and try to connect one no NatPunchRequest messages are sent by the client. If you start the game and choose "Host new game" that is publ...

There seems to be a bug in how NatPunchRequest packets are handled. If I browse the server list and try to connect to a public server I see no such packets being sent unless I host a public server on the client for a few seconds first.

I tried hosting a public game from inside the client on my desktop, which is behind NAT. And then I had some friends try connect to it via the public server list. While doing this I was performing a packet capture to see the NatPunchRequest messages sent to my computer. But I didn't see any when the...

When the ConnectionAcceptOrDeny message from the server is dropped on the way to the client it's possible for the server to end up deadlocked waiting for the client to continue the joining process. See the annotated image of the packet capture I've attached. The server starts sending SynchronizerAct...

Really cool, I'm impressed.