L4D2 server revival help

[PPE_ROoF]

Hey y'all.
I used to run a L4D2 server years ago for the group of guys I game with, but over time it died but now we're wanting to revive it, but unfortunately I don't have any of our old files and now I'm struggling to get it recreated.  

I'll give ya what I've got and then the problem I'm running into:

Running on a private dedicated server, Dell PowerEdge R610, colo'd in a datacenter.
Server OS: Windows Server 2019 Standard
Processor: Dual-socketed Xeon5675 @3.07Ghz - 6 cores, 12 threads per socket
Ram: 64 GB
Game(s): Left 4 Dead 2
Start Up Command that I'm attempting: "D:\Game Servers\L4D2\srcds.exe" -password=xxxxx -hostname="ROoFGaming.net" -game left4dead2 -ip=139.64.137.51 +exec server.cfg -console -secure

Server has five (5) static IPs, so I use the -ip command to tell it which one to bind to.
I've tried a bunch of variations of the start command to troubleshoot, but nothing seems to work.  I'm currently executing the commands in an administrative command prompt, but once I have a properly functioning command, the server will be run as a service under FireDaemon.


The issue I'm having is that it fails to activate Secure mode and fails to exec server.cfg or load any mods (metamod/sourcemod).

Code:

#Console initialized.
#Using breakpad minidump system
#Steam is not active, running in -insecure mode.
#Loading unsigned module server.dll
Access to secure servers is disabled.
#Game.dll loaded for "Left 4 Dead 2"
Server is hibernating
ConVarRef test_progression_loop doesn't point to an existing ConVar
Parent cvar in server.dll not allowed (spit_scaling_min_scale)
Unable to load plugin "addons/metamod/bin/win64/server"
Game supporting (2) split screen players
maxplayers set to 18
CAsyncWavDataCache:  0 .wavs total 0 bytes, 0.00 % of capacity
Unknown command "cl_engine_reload_rosetta"
Unknown command "hud_reloadscheme"
Unknown command "sm_cvar"
Unknown command "sm_cvar"
Unknown command "sm_cvar"
Unknown command "sm_cvar"
Unknown command "sm_cvar"
Unknown command "sm_cvar"
Unknown command "sm_cvar"
Unknown command "sm_advertisements_enabled"
Unknown command "sm_advertisements_interval"
Unknown command "sm_cvar"
Unknown command "sv_maxslots"
Unknown command "l4d_maxplayers"
Unknown command "sv_maxplayers"

However, if I simply double-click srcds.exe and start the server using the GUI, it does all of that just fine.

Lastly, I need this to show up as a Steam Group Server.  I've got our group id, and I've added it to server.cfg, but it doesn't seem to be working.
It doesn't even appear to succeed with binding to the .51 address

Code:

NET_GetBindAddresses found 139.64.137.51: 'QLogic BCM5709C Gigabit Ethernet (NDIS VBD Client) #34'
Network: IP 139.64.137.55, mode MP, dedicated Yes, ports 27015 SV / 0 CL

I've added srcds.exe as being allowed bidirectionally through the firewall.
I cannot think of anything that I'm missing.

[PPE_ROoF]

Minor update:  if I use the full path, but as a relative path, to server.cfg instead of relying on it knowing how to find the relative path in the folder below where it is being called from, then many of the "Unknown command" lines disappear, but not all of them.

The full startup console looks like this, now:

Code:

#Console initialized.
#Using breakpad minidump system
#Steam is not active, running in -insecure mode.
#Loading unsigned module server.dll
Access to secure servers is disabled.
#Game.dll loaded for "Left 4 Dead 2"
Server is hibernating
ConVarRef test_progression_loop doesn't point to an existing ConVar
Parent cvar in server.dll not allowed (spit_scaling_min_scale)
Unable to load plugin "addons/metamod/bin/win64/server"
Game supporting (2) split screen players
maxplayers set to 18
CAsyncWavDataCache:  0 .wavs total 0 bytes, 0.00 % of capacity
Unknown command "cl_engine_reload_rosetta"
Unknown command "hud_reloadscheme"
exec: couldn't exec /Game
Unknown command "mat_bloom_scalefactor_scalar"
Unknown command "cl_engine_reload_rosetta"
Unknown command "hud_reloadscheme"
NET_GetBindAddresses found 139.64.137.51: 'QLogic BCM5709C Gigabit Ethernet (NDIS VBD Client) #34'
Network: IP 139.64.137.55, mode MP, dedicated Yes, ports 27015 SV / 0 CL

However, when using openserverbrowser, the server does not show up.
When launching it with the srcds GUI, it does show up.