Which Left 4 Dead 2 server-admin tools are available?

We list 4 tools for Left 4 Dead 2: Preserving server.cfg editor, Permissions and multiplayer checks, Install, launch and ports, Map and content manifest audit. All of them run straight in your browser.

Which ports does Left 4 Dead 2 need open?

UDP27015 defaults to game and A2S traffic. Optional TCP27015 is RCON: configure your own password and restrict trusted sources. Client port 27005 is not a required inbound server port. Check actual -port, NAT and lobby reservations; a query does not prove map or plugin compatibility.

How do I install a dedicated Left 4 Dead 2 server?

Install it with SteamCMD — the dedicated server app id for Left 4 Dead 2 is 222860, so +app_update 222860 validate downloads or updates it. Config files usually live at left4dead2/cfg/server.cfg, left4dead2/addons/sourcemod/configs/admins_simple.ini, left4dead2/cfg/sourcemod/.

Do these tools cost anything or need installing?

No. Everything runs in the page: no install, no sign-up, no cost. Enter your values and the result appears instantly, and you can copy the generated configs and commands with one click.

PC reference

Preserving server.cfg editor · Left 4 Dead 2

Co-op and dedicated server planning · Co-op FPS

Player tools indexed: 4 Admin consoles: 4

Edit vanilla identity, mode and difficulty only

Player tools (4)

Instant interactive calculations and recipe planners

Effective damage and TTK

Include magazines, reload pauses and effective hits

Open tool →

Connect and local practice commands

Separate client diagnostics from host cheats

Open tool →

Temporary health decay

Estimate remaining buffer using measured decay

Open tool →

Accuracy and ammo budget

Separate hits, shots and stock

Open tool →

Server admin and config generation (4)

Config files, startup scripts and command wizards for running a server

Preserving server.cfg editor

Edit vanilla identity, mode and difficulty only

Generate config →

Permissions and multiplayer checks

Validate SteamID and distinguish plugin roles

Generate config →

Install, launch and ports

Dedicated app 222860 and vanilla modes

Generate config →

Map and content manifest audit

Find missing, duplicate and differing entries

Generate config →

Left 4 Dead 2 Ports & Protocols

Port	Protocol	Purpose
27015	UDP	Game and A2S query

Left 4 Dead 2 Dedicated Server Install (SteamCMD)

SteamCMD appid 222860

sudo useradd -m -s /bin/bash steam
sudo apt update && sudo apt install -y steamcmd lib32gcc-s1
sudo -u steam -i \
  /usr/games/steamcmd +force_install_dir /opt/gameserver \
  +login anonymous +app_update 222860 validate +quit

https://github.com/GameServerManagers/LinuxGSM/blob/master/lgsm/config-default/config-lgsm/l4d2server/_default.cfg

Left 4 Dead 2 Config file paths

left4dead2/cfg/server.cfg
left4dead2/addons/sourcemod/configs/admins_simple.ini
left4dead2/cfg/sourcemod/

Server notes

Dedicated app 222860 supports anonymous SteamCMD installation; game app is 550. Game/A2S default to UDP27015; optional same-port TCP RCON requires your own password and trusted-source restrictions. Vanilla co-op has four survivors; eight total Versus players do not mean eight-person co-op. SourceMod requires MetaMod; expanded co-op also needs matching slot extensions, survivor-bot management and lobby handling. Left4DHooks is a dependency library. Match complete custom-map content; server-only plugins need not all be installed on clients. Do not disable sv_consistency by default. Listing depends on ports, NAT, reservation and actual configuration.

FAQ

Which Left 4 Dead 2 server-admin tools are available?: We list 4 tools for Left 4 Dead 2: Preserving server.cfg editor, Permissions and multiplayer checks, Install, launch and ports, Map and content manifest audit. All of them run straight in your browser.
Which ports does Left 4 Dead 2 need open?: UDP27015 defaults to game and A2S traffic. Optional TCP27015 is RCON: configure your own password and restrict trusted sources. Client port 27005 is not a required inbound server port. Check actual -port, NAT and lobby reservations; a query does not prove map or plugin compatibility.
How do I install a dedicated Left 4 Dead 2 server?: Install it with SteamCMD — the dedicated server app id for Left 4 Dead 2 is 222860, so +app_update 222860 validate downloads or updates it. Config files usually live at left4dead2/cfg/server.cfg, left4dead2/addons/sourcemod/configs/admins_simple.ini, left4dead2/cfg/sourcemod/.
Do these tools cost anything or need installing?: No. Everything runs in the page: no install, no sign-up, no cost. Enter your values and the result appears instantly, and you can copy the generated configs and commands with one click.