"C:\Users\Kyokyo\Desktop\Forge Server\.\mods" is equal to "C:\Users\Kyokyo\Desktop\Forge Server\mods" btw. "." just stands for the current folder.
[21:26:40] [Server thread/INFO] [FML]: Attempting connection with missing mods [minecraft, mcp, FML, forge, aether_legacy, biomesoplenty, lucky, orbis_api] at CLIENT
[21:26:40] [Server thread/INFO] [FML]: Attempting connection with missing mods [minecraft, mcp, FML, forge, aether_legacy, biomesoplenty, lucky, orbis_api] at SERVER
is kinda self-handsake, it seems. I don't know purpose of it, but it occurs while server is starting, not joining. If your client doesn't have required mods, server wouldn't let client join.
What block and which mod's block was that you were trying to place?