Could not establish connection to Steam servers.

[HarmonicWay]

Actual IP : 51.195.97.165:27015

So from yesterday 2am my server doesnt work. Why, no idea. This is console output which i got :

Not updating game server as auto update was set to 0. Starting Server
[KGB Hosting]:./hlds_run -console -game cstrike -port 27015 +map deathrun_wild_easy +ip 0.0.0.0 -strictportbind -norestart +maxplayers 32 +sys_ticrate 333 +mapchangecfgfile server.cfg +fps_max 333 +heapsize 250000 -zone 8192 -num_edicts 4096 -nobreakpad -master +sv_allowdownload 1 +sv_allowupload 0 +sv_downloadurl "http://game1.lim.kgb-hosting.com/d36df280-4c63-46c0-bc0a-628c66678018/cstrike/"
Setting breakpad minidump AppID = 10
Protocol version 48
Exe version 1.1.2.7/Stdio (cstrike)
Exe build: 19:52:21 Mar 27 2025 (4002)
STEAM Auth Server
Server IP address 0.0.0.0:27015

Metamod-r version 1.3.0.149 Copyright (c) 2016-2018 ReHLDS Team (rebuild of original Metamod by Will Day and Jussi Kivilinna)
Metamod-r comes with ABSOLUTELY NO WARRANTY; for details type meta gpl'. This is free software, and you are welcome to redistribute it under certain conditions; type meta gpl' for details.

Metamod-r v1.3.0.149, API (5:13)
Metamod-r build: 18:21:15 Jan 15 2024
Metamod-r from: rehlds/Metamod-R@603a257

AMX Mod X version 1.9.0.5294 Copyright (c) 2004-2015 AMX Mod X Development Team
AMX Mod X comes with ABSOLUTELY NO WARRANTY; for details type `amxx gpl'.
This is free software and you are welcome to redistribute it under
certain conditions; type 'amxx gpl' for details.

L 11/01/2025 - 10:13:44: [GEOIP] Database info: GeoLite2 Country database 2.0
ReGameDLL version: 5.28.0.756-dev
L 11/01/2025 - 10:13:44: -------- Mapchange to deathrun_wild_easy --------
Executing ReGameDLL Configuration File
couldn't exec s16_new/cstrike/addons/metamod/revoice_plus/revoice.cfg
[AMXX] Loaded 13 admins from file
Who read - he died :0
DELETE addons/amxmodx/data/client_analyzer_temp/config.tmp
[CA] Checking for updates...
Client Analyzer 2.8.1 FAME deathrun_ca.amx debug
API_CheckVersion_CB - 24 - 1
[CA] OK! Plugin is up to date. (0ms)
[CA] Loading configuration...
Client Analyzer 2.8.1 FAME deathrun_ca.amx debug
API_LoadConfig_CB - 24 - 2
DELETE addons/amxmodx/data/client_analyzer_temp/config.tmp
[CA] OK! Configuration successfully loaded. (0ms)
[MPBHOP] 19 bhop blocks detected
L 11/01/2025 - 10:13:45: [AMXX] Failed to open dictionary file: cstrike/addons/amxmodx/data/lang/entity_remover.txt
Executing AMX Mod X Configuration File
Scrolling message displaying frequency: 10:00 minutes
Executing AMX Mod X Configuration File
Scrolling message displaying frequency: 10:00 minutes
Map Manager Settings Loaded
[S_API FAIL] SteamAPI_Init() failed; SteamAPI_IsSteamRunning() failed.
CAppInfoCacheReadFromDiskThread took 0 milliseconds to initialize
CApplicationManagerPopulateThread took 0 milliseconds to initialize (will have waited on CAppInfoCacheReadFromDiskThread)

L 11/01/2025 - 10:13:47: Player 1 is either not connected or a bot
L 11/01/2025 - 10:13:47: [AMXX] Displaying debug trace (plugin "deathrun_cvar_checker.amxx", version "1.0")
L 11/01/2025 - 10:13:47: [AMXX] Run time error 10: native error (native "query_client_cvar")
L 11/01/2025 - 10:13:47: [AMXX] [0] deathrun_cvar_checker.sma::Init_Checks (line 38)
L 11/01/2025 - 10:13:47: Player 2 is either not connected or a bot
L 11/01/2025 - 10:13:47: [AMXX] Displaying debug trace (plugin "deathrun_cvar_checker.amxx", version "1.0")
L 11/01/2025 - 10:13:47: [AMXX] Run time error 10: native error (native "query_client_cvar")
L 11/01/2025 - 10:13:47: [AMXX] [0] deathrun_cvar_checker.sma::Init_Checks (line 38)
L 11/01/2025 - 10:13:48: Player 3 is either not connected or a bot
L 11/01/2025 - 10:13:48: [AMXX] Displaying debug trace (plugin "deathrun_cvar_checker.amxx", version "1.0")
L 11/01/2025 - 10:13:48: [AMXX] Run time error 10: native error (native "query_client_cvar")
L 11/01/2025 - 10:13:48: [AMXX] [0] deathrun_cvar_checker.sma::Init_Checks (line 38)
cminterface.cpp (2667) : Assertion Failed: m_VecNetAdrNetFilterCMs.Count() > 0
cminterface.cpp (2667) : Assertion Failed: m_VecNetAdrNetFilterCMs.Count() > 0
Could not establish connection to Steam servers.
cminterface.cpp (2667) : Assertion Failed: m_VecNetAdrNetFilterCMs.Count() > 0
cminterface.cpp (2667) : Assertion Failed: m_VecNetAdrNetFilterCMs.Count() > 0
cminterface.cpp (2667) : Assertion Failed: m_VecNetAdrNetFilterCMs.Count() > 0
cminterface.cpp (2667) : Assertion Failed: m_VecNetAdrNetFilterCMs.Count() > 0
cminterface.cpp (2667) : Assertion Failed: m_VecNetAdrNetFilterCMs.Count() > 0
cminterface.cpp (2667) : Assertion Failed: m_VecNetAdrNetFilterCMs.Count() > 0

[0Ky]

Start the server using the latest HLDS with a clean installation from SteamCMD, do not install Metamod or AMX Mod X and keep the launch options simple:

-console -game cstrike -port 27015 +maxplayers 32 +map de_dust2

It looks like you're having trouble connecting to the Steam servers. Make sure HLDS isn't running behind a VPN or proxy and double-check that you don't have any DNS related issues.

I'm kind of going in blind here, but I've seen similar issues get resolved by installing the following packages:

sudo apt install libcurl3:i386 libnss-resolve:i386 nscd 
sudo service nscd start

[Half-Modern]

You are using an unofficial build of HLDS, which is called ReHLDS, therefore you may not get official support from Valve.
You might better be reporting to ReHLDS repo instead.