Wrong port listed on FAQ page for Steam Local Network Game Transfers

steamopen Steam clientWeb

ValveSoftware/steam-for-linux#9938 · opened 2023-08-01 by DanielGaaA · updated 2025-12-24 · 5 comments · github

DDanielGaaA 2023-08-01 github

On FAQ page for "Steam Local Network Game Transfers" wrong port is listed
https://help.steampowered.com/en/faqs/view/46BD-6BA8-B012-CE43

The network transfer happens on TCP port 24070 and it needs to be allowed by local firewall software.

But for me steam is listening on port 27040

 sudo lsof -i -P -n | grep steam
steam     30596 daniel   39u  IPv4  994281      0t0  TCP 127.0.0.1:57343 (LISTEN)
steam     30596 daniel   43u  IPv4 1038497      0t0  TCP 127.0.0.1:42777 (LISTEN)
steam     30596 daniel   76u  IPv4 1039494      0t0  TCP 127.0.0.1:27060 (LISTEN)
steam     30596 daniel   92u  IPv4 1038502      0t0  TCP 127.0.0.1:33309 (LISTEN)
steam     30596 daniel  105u  IPv4 1048339      0t0  TCP 127.0.0.1:27060->127.0.0.1:48446 (ESTABLISHED)
steam     30596 daniel  107u  IPv4 1034461      0t0  TCP 192.168.0.101:42197->155.133.230.34:27036 (ESTABLISHED)
steam     30596 daniel  108u  IPv6 3168656      0t0  TCP *:27040 (LISTEN)
steam     30596 daniel  109u  IPv6 3168657      0t0  TCP 192.168.0.101:27040->192.168.0.143:60331 (ESTABLISHED)
steam     30596 daniel  110u  IPv4 1042437      0t0  TCP 127.0.0.1:33309->127.0.0.1:51698 (ESTABLISHED)
steam     30596 daniel  115u  IPv4 1032891      0t0  TCP 127.0.0.1:42777->127.0.0.1:41432 (ESTABLISHED)
steam     30596 daniel  120u  IPv4 1047720      0t0  UDP *:27036 
steam     30596 daniel  121u  IPv4 1047721      0t0  TCP *:27036 (LISTEN)
steamwebh 30718 daniel   30u  IPv4 1034464      0t0  TCP 127.0.0.1:51698->127.0.0.1:33309 (ESTABLISHED)
steamwebh 30718 daniel   31u  IPv4 1034467      0t0  TCP 127.0.0.1:41432->127.0.0.1:42777 (ESTABLISHED)
steamwebh 30718 daniel   34u  IPv4 1038871      0t0  TCP 127.0.0.1:48446->127.0.0.1:27060 (ESTABLISHED)
steamwebh 30718 daniel   35u  IPv4 3030756      0t0  TCP 192.168.0.101:57952->95.101.75.38:443 (ESTABLISHED)

Also port is missing from "Required Ports for Steam" FAQ page:
https://help.steampowered.com/en/faqs/view/2EA8-4D75-DA21-31EB

Kkisak-valve maintainer 2023-08-01 github

Hello @DanielGaaA, it may be worthwhile to also report this to Steam Support as a documentation issue.

DDanielGaaA 2023-08-02 github

After your suggestion I contacted steam support and they redirected me back here.

Hi there,

We're sorry you're having issues with Steam on Linux.

Please submit all issues and bugs to the bug database using a GitHub account. This database is regularly reviewed by the Valve developer team.

In the meantime, the best source for further troubleshooting steps and suggestions can be found in the Steam for Linux community discussion.

You can also find current support documentation for the Steam for Linux client here.

Thanks for using Steam,
Alexey

Kkoloved 2023-12-09 github

Same issue, the port is different for me - its also 27040

Solution is add that port to the firewalld -
sudo firewall-cmd --zone=public --add-port=27040/tcp --permanent

sudo lsof -i -P -n | grep steam

steam     9591      love  39u  IPv4  976329      0t0  TCP 127.0.0.1:57343 (LISTEN)
steam     9591      love  43u  IPv4  977418      0t0  TCP 127.0.0.1:37327 (LISTEN)
steam     9591      love  73u  IPv6 1027255      0t0  TCP *:27040 (LISTEN)
steam     9591      love  76u  IPv4  977425      0t0  TCP 127.0.0.1:27060 (LISTEN)
steam     9591      love  77u  IPv4  954151      0t0  TCP 127.0.0.1:38349 (LISTEN)
steam     9591      love 102u  IPv6 1002165      0t0  TCP 192.168.1.175:27040->192.168.1.177:49373 (ESTABLISHED)
steam     9591      love 108u  IPv4  983205      0t0  TCP 192.168.1.175:40213->146.66.155.54:27038 (ESTABLISHED)
steam     9591      love 117u  IPv4  977431      0t0  TCP 127.0.0.1:38349->127.0.0.1:47268 (ESTABLISHED)
steam     9591      love 118u  IPv4  973618      0t0  TCP 127.0.0.1:37327->127.0.0.1:35468 (ESTABLISHED)
steam     9591      love 122u  IPv4  959355      0t0  UDP *:27036 
steam     9591      love 124u  IPv4  959356      0t0  TCP *:27036 (LISTEN)
steamwebh 9693      love  30u  IPv4  976380      0t0  TCP 127.0.0.1:47268->127.0.0.1:38349 (ESTABLISHED)
steamwebh 9693      love  31u  IPv4  982083      0t0  TCP 127.0.0.1:35468->127.0.0.1:37327 (ESTABLISHED)
steamwebh 9693      love  35u  IPv4 1002159      0t0  TCP 192.168.1.175:57136->2.18.69.117:443 (ESTABLISHED)
steamwebh 9693      love  37u  IPv4 1002162      0t0  TCP 192.168.1.175:52936->79.101.14.16:443 (ESTABLISHED)
steamwebh 9693      love  38u  IPv4 1002160      0t0  TCP 192.168.1.175:57144->2.18.69.117:443 (ESTABLISHED)

DDanMan 2024-03-07 github

@koloved Do you know, if the UDP ports listed on the Steam homepage are required, too?

Then this all could be added to Firewalld, so it works OOTB: https://github.com/firewalld/firewalld/pull/1216

Ddchang0 2025-12-24 github

@koloved Do you know, if the UDP ports listed on the Steam homepage are required, too?

Then this all could be added to Firewalld, so it works OOTB: firewalld/firewalld#1216

I am not koloved, but I can absolutely say that yes, the UDP ports 27031-270136 are required. Without them, the Steam-for-LINUX client will not be discovered by other Steam hosts on the LAN. I struggled with this for a while until finding that documentation, and as soon as I opened the UDP ports in my firewall, bam, Local Network Transfers started working on my LINUX PC.

Nothing extracted yet.