"id 20349 is mismatched between world and game
forge mod loader has found id mismatches"
this is the error my friends get when i create a server (open to lan), or i use the official server files(dedicated). i have found that some mods are changing the id of ingame items in order to prevent conflicting ids, and somehow those mods are giving randomised numbers depending on the host os (which made sense, in a way, since i had win 8.1, and one of my friend had win8, other had win7) then i tried the dedicated server, we rented a server, uploaded jar, created a whole new world, i could connect and again, all my friends received this error (and if i am not wrong, that id number is changing from time to time, but i am not sure atm)
i made them create a server, and i could join, but when i create a server, or when we use our dedicated server, it is impossible for them to join. i tried both recommended(1.3.9) and latest beta (1.3.13) and still no luck.
though while writing this something came to my mind, which i cannot try without my friend; since i am the one setting the server up and testing it, i am the first person ever connects to the server. when my friends create the server, they are the first ones to connect to server. so i assume that server is getting ids from that person's client therefore, when i set it, it gets ids from me, and they are different from theirs, but when they set it up, my pc "shomehow" adapts my ids to theirs (it sounds stupid when i read it ) so for this theory, i will delete all the files from my dedicated server, set it up, and make them connect first.
anyway, does anyone have a real solution for this? i can connect to any server (including mine and theirs) they cannot connect anyone but their own. and since we are going to use a dedicated one, we need to connect that server my pc (incase it is necessary)
intel i7 2600k extreme edition (stock)
16gb (4x4) ddr3 1600 MHz ram
240 gb Kingston SSD, 16 TB HDD (tried installing the server to all my 5 internal drives)
windows 8.1 pro x64
Java 7 (Update 9) (x64)
Java 7 (update 51)