Stuck at subnet check

[LovenityJade]

Hi,

I'm new here and just started to make my server and all. So, here's my issue. I use the latest rAthena build for linux, compiled it for packetver 201806020 (packet obfuscation disabled), same with my ragexere (also 20180620) which has the packet obfuscation off. All goes well up tot this point. Server runs well, I can login to it without any issue, I get to the character screen, create a character.... no issue this far. Then when it comes to login:

Client-side stuck on "Connecting to server..." (in korean, I haven't yet translated my client)
Server-side stuck on Subnet check (IP) WAN

Then the client timesout (but my connection is still active on my server).

I searched the forums throughout and saw only old post that is not relevant to my current version, so I was wondering what am I doing wrong ? Or what should I do instead of what I'm already doing. 

Thanks

FIXED: Using 20151029 client and diffed it. Thanks.

Edited April 7, 2019 by LovenityJade