I'm having the same problem, i opened a chat with support, it seems that the problem is not at the server, but i don't know about, just wanted to play with friends.
DEBUG: General , 1670184570967> LoggerManager.init > Initializing...
LOG : General , 1670184571014> cachedir set to "C:\Users\ferna\Zomboid"
LOG : General , 1670184571029> 04-12-2022 17:09:31
LOG : General , 1670184571029> cachedir is "C:\Users\ferna\Zomboid"
LOG : General , 1670184571029> LogFileDir is "C:\Users\ferna\Zomboid\Logs"
LOG : General , 1670184571029> ===== System specs =====
LOG : General , 1670184571029> OS: Windows 10, version: 10.0, arch: amd64
LOG : General , 1670184571043> Processor: Intel64 Family 6 Model 140 Stepping 1, GenuineIntel
LOG : General , 1670184571043> Processor cores: 8
LOG : General , 1670184571043> Available processors (cores): 8
LOG : General , 1670184571045> Memory free: 101.55803 MB
LOG : General , 1670184571045> Memory max: 3072.0 MB
LOG : General , 1670184571045> Memory total available to JVM: 124.0 MB
LOG : General , 1670184571045> C:\, Total: 223.13574 GB, Free: 43.735317 GB
LOG : General , 1670184571045> D:\, Total: 698.13086 GB, Free: 394.812 GB
LOG : General , 1670184571166> Mobo = [Product=NP550XDA-KH2BR]
LOG : General , 1670184571273> CPU = [Manufacturer=GenuineIntel,MaxClockSpeed=2419,Name=11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz]
LOG : General , 1670184571390> Graphics = [AdapterRAM=1073741824,DriverVersion=30.0.100.9805,Name=Intel(R) Iris(R) Xe Graphics]
LOG : General , 1670184571506> VideoMode = [VideoModeDescription=1920 x 1080 x 4294967296 cores]
LOG : General , 1670184571612> Sound = { [Manufacturer=Intel(R) Corporation,Name=Tecnologia Intel© Smart Sound para udio USB], [Manufacturer=Realtek,Name=Realtek High Definition Audio] }
LOG : General , 1670184571726> Memory RAM = [Capacity=8589934592]
LOG : General , 1670184571726> ========================
LOG : General , 1670184571727> -- listing properties --
LOG : General , 1670184571727> java.specification.version=17
LOG : General , 1670184571728> sun.cpu.isalist=amd64
LOG : General , 1670184571728> sun.jnu.encoding=Cp1252
LOG : General , 1670184571728> java.class.path=.;commons-compress-1.18.jar;istack-co...
LOG : General , 1670184571728> java.vm.vendor=Azul Systems, Inc.
LOG : General , 1670184571729> sun.arch.data.model=64
LOG : General , 1670184571729> user.variant=
LOG : General , 1670184571729> java.vendor.url=http://www.azul.com/
LOG : General , 1670184571729> user.timezone=America/Sao_Paulo
LOG : General , 1670184571729> zomboid.steam=1
LOG : General , 1670184571729> java.vm.specification.version=17
LOG : General , 1670184571729> os.name=Windows 10
LOG : General , 1670184571729> user.country=BR
LOG : General , 1670184571729> sun.boot.library.path=D:\SteamLibrary\steamapps\common\Proj...
LOG : General , 1670184571729> zomboid.znetlog=1
LOG : General , 1670184571729> jdk.debug=release
LOG : General , 1670184571729> sun.cpu.endian=little
LOG : General , 1670184571729> user.home=C:\Users\ferna
LOG : General , 1670184571729> user.language=pt
LOG : General , 1670184571729> java.specification.vendor=Oracle Corporation
~deleted part because of 10k characters~
LOG : Lua , 1670184585915> Loading: media/lua/shared/Sandbox/Apocalypse.lua
LOG : Lua , 1670184585916> Loading: media/lua/shared/Sandbox/Apocalypse.lua
LOG : Lua , 1670184585917> Loading: media/lua/shared/Sandbox/Beginner.lua
LOG : Lua , 1670184585918> Loading: media/lua/shared/Sandbox/Apocalypse.lua
LOG : Lua , 1670184585918> Loading: media/lua/shared/Sandbox/Apocalypse.lua
LOG : Lua , 1670184585919> Loading: media/lua/shared/Sandbox/FirstWeek.lua
LOG : Lua , 1670184585920> Loading: media/lua/shared/Sandbox/Apocalypse.lua
LOG : Lua , 1670184585921> Loading: media/lua/shared/Sandbox/Apocalypse.lua
LOG : Lua , 1670184585921> Loading: media/lua/shared/Sandbox/Survival.lua
LOG : Lua , 1670184585922> Loading: media/lua/shared/Sandbox/Apocalypse.lua
LOG : Lua , 1670184585923> Loading: media/lua/shared/Sandbox/Apocalypse.lua
LOG : Lua , 1670184585923> Loading: media/lua/shared/Sandbox/SixMonthsLater.lua
LOG : Lua , 1670184585924> Loading: media/lua/shared/Sandbox/Apocalypse.lua
LOG : Lua , 1670184585925> Loading: media/lua/shared/Sandbox/Apocalypse.lua
LOG : General , 1670184585926> reading C:\Users\ferna\Zomboid\Sandbox Presets\DJ.cfg
LOG : Lua , 1670184585927> Loading: media/lua/shared/Sandbox/Apocalypse.lua
LOG : General , 1670184585928> reading C:\Users\ferna\Zomboid\Sandbox Presets\New.cfg
LOG : Lua , 1670184585971> Loading: media/lua/shared/Sandbox/Apocalypse.lua
LOG : General , 1670184586029> EXITDEBUG: MainScreenState.enter 2
LOG : General , 1670184593476> -----------------------------------------
STACK TRACE
-----------------------------------------
Callframe at: serverConnect
function: connect -- file: ConnectToServer.lua line # 188 | Vanilla
function: onOptionMouseDown -- file: ServerConnectPopup.lua line # 192 | Vanilla
function: onMouseUp -- file: ISButton.lua line # 56 | Vanilla
ERROR: General , 1670184593478> ExceptionLogger.logException> Exception thrown java.lang.IllegalArgumentException at NativeMethodAccessorImpl.invoke0 (Native Method).
ERROR: General , 1670184593478> DebugLogStream.printException> Stack trace:
java.lang.IllegalArgumentException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at se.krka.kahlua.integration.expose.caller.MethodCaller.call(MethodCaller.java:62)
at se.krka.kahlua.integration.expose.LuaJavaInvoker.call(LuaJavaInvoker.java:198)
at se.krka.kahlua.integration.expose.LuaJavaInvoker.call(LuaJavaInvoker.java:188)
at se.krka.kahlua.vm.KahluaThread.callJava(KahluaThread.java:182)
at se.krka.kahlua.vm.KahluaThread.luaMainloop(KahluaThread.java:1007)
at se.krka.kahlua.vm.KahluaThread.call(KahluaThread.java:163)
at se.krka.kahlua.vm.KahluaThread.pcall(KahluaThread.java:1980)
at se.krka.kahlua.vm.KahluaThread.pcallBoolean(KahluaThread.java:1924)
at se.krka.kahlua.integration.LuaCaller.protectedCallBoolean(LuaCaller.java:104)
at zombie.ui.UIElement.onMouseUp(UIElement.java:1228)
at zombie.ui.UIElement.onMouseUp(UIElement.java:1183)
at zombie.ui.UIElement.onMouseUp(UIElement.java:1183)
at zombie.ui.UIManager.update(UIManager.java:816)
at zombie.GameWindow.logic(GameWindow.java:262)
at zombie.core.profiling.AbstractPerformanceProfileProbe.invokeAndMeasure(AbstractPerformanceProfileProbe.java:71)
at zombie.GameWindow.frameStep(GameWindow.java:765)
at zombie.GameWindow.run_ez(GameWindow.java:681)
at zombie.GameWindow.mainThread(GameWindow.java:495)
at java.base/java.lang.Thread.run(Unknown Source)
LOG : General , 1670184686942> EXITDEBUG: RenderThread.isCloseRequested 1
LOG : General , 1670184686943> EXITDEBUG: GameWindow.exit 1
LOG : General , 1670184686944> EXITDEBUG: GameWindow.exit 2
LOG : General , 1670184686944> EXITDEBUG: GameWindow.exit 3
LOG : General , 1670184686976> EXITDEBUG: GameWindow.exit 4
LOG : General , 1670184687046> GameThread exited.
LOG : General , 1670184687046> EXITDEBUG: GameWindow.exit 5