I hope this might help.
I have finally managed to access the forum But, I can do that only if browsing while using a VPN.
my PC runs windows 7 pro + Service Pack 1
On chrome version 53, while running Betternet 4.0.7
Same for Firefox 49 + Browsec 2.0.3
I can access the forum. Without the VPN i get:
Data too long for column 'ip' at row 1
On Opera Stable 40 I get the same line of code if I try to access the forum