External IP connection errors (port help)

[TropiKo]

Hello,
I have just installed srcds properly through steamcmd, I have a working cfg and I can connect through LAN. However when trying to connect through internet (in console because i can't see it in browser/favourites) I get this :
] connect 109.100.42.32
]
WARNING: Port 27015 was unavailable - bound to port 27016 instead
WARNING: Port 27005 was unavailable - bound to port 27006 instead
WARNING: Port 27020 was unavailable - bound to port 27021 instead
Network: IP 192.168.1.4, mode MP, dedicated No, ports 27016 SV / 27006 CL
Connecting to 109.100.42.32...
Retrying 109.100.42.32...
Retrying 109.100.42.32...
Retrying 109.100.42.32...
Connection failed after 4 retries.

I have 2 routers, I've tried port forwarding through the second. Now I am running on just one ( a huawei HG665b modem/router) and it's the same thing. I've opened 27000 to 27050 supposedly, entered my internal Ip to DMZ in both wan6 and wan3 (I have no idea what they are).
So the server works but the ports are supposedly already in use or blocked. I've started the server before opening steam, still nothing.

Any help is a appreciated!

[TropiKo]

This is the .bat I'm using
@echo off
cls
echo Protecting srcds from crashes...
echo If you want to close srcds and this script, close the srcds window and type Y depending on your language followed by Enter.
title srcds.com Watchdog
:srcds
echo (%time%) srcds started.
start /wait srcds.exe -console -autoupdate -game cstrike +map de_dust2 +maxplayers 20
echo (%time%) WARNING: srcds closed or crashed, restarting.
goto srcds

[TropiKo]

I've opened port 27015, canyouseeme.org and yougetsignal.com shows it's open.
I've added +port 27015 to the .bat, still says was unavailable.
Is this because I'm trying to connect from the same internal IP. I'll post asap if this is the issue.

[TropiKo]

It was indeed the fault of the port already being used by srcds. My friend joined and the server works although it doesn't show on the browser. Anyone help please?