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[GH-ISSUE #4799] [Bug]: Project Zomboid server requires steamclient.so update - Steam mod authentication failing #2977

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opened 2026-02-27 03:06:36 +03:00 by kerem · 3 comments

kerem commented

2026-02-27 03:06:36 +03:00

Owner

Originally created by @Minidoracat on GitHub (Jul 18, 2025).
Original GitHub issue: https://github.com/GameServerManagers/LinuxGSM/issues/4799

User story

I want LinuxGSM to include the updated steamclient.so file so that my server can properly authenticate and load Steam Workshop mods without manual intervention.

Game

Project Zomboid

Linux distro

Ubuntu 24.04

Command

command: start

Further information

Hello,
I'd like to report an issue affecting Project Zomboid dedicated servers managed through LinuxGSM. The server's library needs to be updated to resolve Steam mod authentication failures.steamclient.so
Problem:
Project Zomboid servers are experiencing issues with Steam workshop mod authentication, causing mods to fail loading or authenticate properly. This appears to be due to an outdated library.steamclient.so
Solution:
The Project Zomboid development team has confirmed this issue and provided an updated file that resolves the problem.steamclient.so
References:

Reddit discussion documenting the issue: https://www.reddit.com/r/projectzomboid/comments/1lyw5ww/psa_for_all_server_owners_who_is_facing_steam_mod/
Official fix from PZ developers on Discord: https://discord.com/channels/136501320340209664/1394252791966601226/1394252791966601226

Suggested Action:
Please consider updating the file for Project Zomboid servers in LinuxGSM to match the version provided by the developers. This will help server administrators avoid manual intervention and ensure smooth mod functionality.steamclient.so
Thank you for maintaining this excellent tool!

Relevant log output


LOG  : General     , 1752872666609> 108,762,938> Workshop: DownloadPending GetItemState()=NeedsUpdate|Downloading|DownloadPending ID=2844685624
LOG  : General     , 1752872666610> 108,762,938> Workshop: download 6160/101645776 ID=2844685624
LOG  : General     , 1752872666709> 108,763,037> Workshop: DownloadPending GetItemState()=NeedsUpdate|Downloading|DownloadPending ID=2844685624
LOG  : General     , 1752872666709> 108,763,038> Workshop: download 6160/101645776 ID=2844685624
LOG  : General     , 1752872666809> 108,763,137> Workshop: DownloadPending GetItemState()=NeedsUpdate|Downloading|DownloadPending ID=2844685624
LOG  : General     , 1752872666809> 108,763,137> Workshop: download 6160/101645776 ID=2844685624
LOG  : General     , 1752872666942> 108,763,270> Workshop: DownloadPending GetItemState()=NeedsUpdate|Downloading|DownloadPending ID=2844685624
LOG  : General     , 1752872666942> 108,763,270> Workshop: download 6160/101645776 ID=2844685624
LOG  : General     , 1752872667041> 108,763,370> Workshop: DownloadPending GetItemState()=NeedsUpdate|Downloading|DownloadPending ID=2844685624
LOG  : General     , 1752872667042> 108,763,370> Workshop: download 6160/101645776 ID=2844685624
^Csrc/common/completionportmanager_posix.cpp (347) : Assertion Failed: Invalid async I/O handle 76
src/common/completionportmanager_posix.cpp (347) : Assertion Failed: Invalid async I/O handle 76
src/common/completionportmanager_posix.cpp (347) : Assertion Failed: Invalid async I/O handle 77
src/common/completionportmanager_posix.cpp (347) : Assertion Failed: Invalid async I/O handle 77
src/common/completionportmanager_posix.cpp (347) : Assertion Failed: Invalid async I/O handle 78
src/common/completionportmanager_posix.cpp (347) : Assertion Failed: Invalid async I/O handle 78
src/common/completionportmanager_posix.cpp (347) : Assertion Failed: Invalid async I/O handle 73
src/common/completionportmanager_posix.cpp (347) : Assertion Failed: Invalid async I/O handle 73

Steps to reproduce

No response

Originally created by @Minidoracat on GitHub (Jul 18, 2025). Original GitHub issue: https://github.com/GameServerManagers/LinuxGSM/issues/4799 ### User story I want LinuxGSM to include the updated steamclient.so file so that my server can properly authenticate and load Steam Workshop mods without manual intervention. ### Game Project Zomboid ### Linux distro Ubuntu 24.04 ### Command command: start ### Further information Hello, I'd like to report an issue affecting Project Zomboid dedicated servers managed through LinuxGSM. The server's library needs to be updated to resolve Steam mod authentication failures.steamclient.so Problem: Project Zomboid servers are experiencing issues with Steam workshop mod authentication, causing mods to fail loading or authenticate properly. This appears to be due to an outdated library.steamclient.so Solution: The Project Zomboid development team has confirmed this issue and provided an updated file that resolves the problem.steamclient.so References: Reddit discussion documenting the issue: https://www.reddit.com/r/projectzomboid/comments/1lyw5ww/psa_for_all_server_owners_who_is_facing_steam_mod/ Official fix from PZ developers on Discord: https://discord.com/channels/136501320340209664/1394252791966601226/1394252791966601226 Suggested Action: Please consider updating the file for Project Zomboid servers in LinuxGSM to match the version provided by the developers. This will help server administrators avoid manual intervention and ensure smooth mod functionality.steamclient.so Thank you for maintaining this excellent tool! ### Relevant log output ```shell LOG : General , 1752872666609> 108,762,938> Workshop: DownloadPending GetItemState()=NeedsUpdate|Downloading|DownloadPending ID=2844685624 LOG : General , 1752872666610> 108,762,938> Workshop: download 6160/101645776 ID=2844685624 LOG : General , 1752872666709> 108,763,037> Workshop: DownloadPending GetItemState()=NeedsUpdate|Downloading|DownloadPending ID=2844685624 LOG : General , 1752872666709> 108,763,038> Workshop: download 6160/101645776 ID=2844685624 LOG : General , 1752872666809> 108,763,137> Workshop: DownloadPending GetItemState()=NeedsUpdate|Downloading|DownloadPending ID=2844685624 LOG : General , 1752872666809> 108,763,137> Workshop: download 6160/101645776 ID=2844685624 LOG : General , 1752872666942> 108,763,270> Workshop: DownloadPending GetItemState()=NeedsUpdate|Downloading|DownloadPending ID=2844685624 LOG : General , 1752872666942> 108,763,270> Workshop: download 6160/101645776 ID=2844685624 LOG : General , 1752872667041> 108,763,370> Workshop: DownloadPending GetItemState()=NeedsUpdate|Downloading|DownloadPending ID=2844685624 LOG : General , 1752872667042> 108,763,370> Workshop: download 6160/101645776 ID=2844685624 ^Csrc/common/completionportmanager_posix.cpp (347) : Assertion Failed: Invalid async I/O handle 76 src/common/completionportmanager_posix.cpp (347) : Assertion Failed: Invalid async I/O handle 76 src/common/completionportmanager_posix.cpp (347) : Assertion Failed: Invalid async I/O handle 77 src/common/completionportmanager_posix.cpp (347) : Assertion Failed: Invalid async I/O handle 77 src/common/completionportmanager_posix.cpp (347) : Assertion Failed: Invalid async I/O handle 78 src/common/completionportmanager_posix.cpp (347) : Assertion Failed: Invalid async I/O handle 78 src/common/completionportmanager_posix.cpp (347) : Assertion Failed: Invalid async I/O handle 73 src/common/completionportmanager_posix.cpp (347) : Assertion Failed: Invalid async I/O handle 73 ``` ### Steps to reproduce _No response_

kerem added the

type: bug

distro: Ubuntu

game: Project Zomboid

command: start

labels

2026-02-27 03:06:36 +03:00

kerem commented

2026-02-27 03:06:36 +03:00

Author

Owner

@clbx commented on GitHub (Jul 18, 2025):

I am also having this issue

@clbx commented on GitHub (Jul 18, 2025): I am also having this issue

kerem commented

2026-02-27 03:06:36 +03:00

Author

Owner

@Minidoracat commented on GitHub (Jul 18, 2025):

I am also having this issue

You can download the updated steamclient.so file from: https://discord.com/channels/136501320340209664/1394252791966601226/1394252791966601226
Then replace the existing file at: /home/pzserver/serverfiles/linux64/steamclient.so
This should fix the Steam mod authentication issues.

@Minidoracat commented on GitHub (Jul 18, 2025): > I am also having this issue You can download the updated steamclient.so file from: https://discord.com/channels/136501320340209664/1394252791966601226/1394252791966601226 Then replace the existing file at: /home/pzserver/serverfiles/linux64/steamclient.so This should fix the Steam mod authentication issues.

kerem commented

2026-02-27 03:06:36 +03:00

Author

Owner

@clbx commented on GitHub (Jul 18, 2025):

I am also having this issue

You can download the updated steamclient.so file from: https://discord.com/channels/136501320340209664/1394252791966601226/1394252791966601226 Then replace the existing file at: /home/pzserver/serverfiles/linux64/steamclient.so This should fix the Steam mod authentication issues.

Its also already in the container at /data/.steam/sdk64 I was able to get this working by coping it from there

@clbx commented on GitHub (Jul 18, 2025): > > I am also having this issue > > You can download the updated steamclient.so file from: https://discord.com/channels/136501320340209664/1394252791966601226/1394252791966601226 Then replace the existing file at: /home/pzserver/serverfiles/linux64/steamclient.so This should fix the Steam mod authentication issues. Its also already in the container at ``/data/.steam/sdk64`` I was able to get this working by coping it from there