Access denied error code 1020 (for learning purpose)

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I suspect that I was blacklisted from accessing a web platform (please don't ask what is) and I'm not complaining about that.
What worries me is IF I was blacklisted, how can they know who to blacklist?
In the mean time I changed internet provider (so different IPs) and the entire network hardware and configuration so am I still blacklisted or am I just being paranoic?
For learning purpose only so if I'm really blacklisted, be it I don't mind but I want to understand how does it work.
Thanks in advance.
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom build
OS
Windows 7 Ultimate x64
CPU
Intel i5-6600K 3.50GHz
Motherboard
Asus Pro Z170 Gaming
Memory
Corsair DDR4 2x8GB
Graphics Card(s)
MSI GeForce GTX1070 Gaming X
Sound Card
On board Realtek
Monitor(s) Displays
Dell SP2309W
Screen Resolution
1920x1080
Hard Drives
OS Samsung 850 EVO 500GB SATA III SSD
2x Hitachi Deskstar 1GB SATA data drives
1x Western Digital Caviar Black 1TB SATA data drive
PSU
Corsair HX650W
Case
CoolerMaster CM 690 III
Cooling
Coolermaster Hyper 212 EVO 1x200mm 1x140mm 2x120mm case fan
Keyboard
Logitech usb keyboard
Mouse
Logitech G500 $27 bargain :)
Internet Speed
ADSL2
Antivirus
Microsoft Security Essential, MalwareBytes
Browser
SRWare Iron, Internet Explorer
Other Info
Very happy with this buid.
I struggled a lot to find all compatible parts since I wanted an Intel 1151 based motherboard so to be able to install Windows 7.
I chose this case because it has amazing air flow, it's sturdy and looks good.
The case included 1x 200mm front and 1x 120mm back fans, I added 1x 200mm on the top and 1x120 bottom fans and modded the panels with black stockings for women s
Cloudflare?

Then it could be a WHOLE lot of things... The IP address, the ASN, their WAF (Web Application Firewall), type of browser, request method, you freaking name it.

Were you using a VPN, a proxy, Tor? Even whole countries can be blocked.
 

My Computer

Computer type
PC/Desktop
OS
Windows 7 Ultimate x64
I am not using any of those [FONT=&quot]VPN, proxy or Tor.
And they didn't block the entire country because the platform is 100% active.
Also I can access it by using an Android emulator's browser on my tablet, just the desktop PC is locked out, but as I said I changed internet provider and the whole hardware.
[/FONT]
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom build
OS
Windows 7 Ultimate x64
CPU
Intel i5-6600K 3.50GHz
Motherboard
Asus Pro Z170 Gaming
Memory
Corsair DDR4 2x8GB
Graphics Card(s)
MSI GeForce GTX1070 Gaming X
Sound Card
On board Realtek
Monitor(s) Displays
Dell SP2309W
Screen Resolution
1920x1080
Hard Drives
OS Samsung 850 EVO 500GB SATA III SSD
2x Hitachi Deskstar 1GB SATA data drives
1x Western Digital Caviar Black 1TB SATA data drive
PSU
Corsair HX650W
Case
CoolerMaster CM 690 III
Cooling
Coolermaster Hyper 212 EVO 1x200mm 1x140mm 2x120mm case fan
Keyboard
Logitech usb keyboard
Mouse
Logitech G500 $27 bargain :)
Internet Speed
ADSL2
Antivirus
Microsoft Security Essential, MalwareBytes
Browser
SRWare Iron, Internet Explorer
Other Info
Very happy with this buid.
I struggled a lot to find all compatible parts since I wanted an Intel 1151 based motherboard so to be able to install Windows 7.
I chose this case because it has amazing air flow, it's sturdy and looks good.
The case included 1x 200mm front and 1x 120mm back fans, I added 1x 200mm on the top and 1x120 bottom fans and modded the panels with black stockings for women s
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