Forge 1.12.2 need help

[n1k4e]

Hi i instal my own server 1.12.2 Forge and i add IC2 (Industrial Craft 2) so when i join the server mod wont work like i can take items and see them but i cant use them when i try to use the drill block wont brake and when i try to put some IC2 bloc wont place, and in singleplayer i cant use and everything work fine but in multiplayer on my server wont work i need help tnx.

[n1k4e]

ok i will try tnx