Hi!! Thanks for the comments and trying to help me with this problem. I'm so idiot!!! Now i know what was the problem: the mods were not compatible. I tried deleting some mods and it functioned! I hope help someone in the same situation
Posts by Euronymous892
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And where is the client log? thanks for help!!
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I've checked and all the mods are in the same version and the server too

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In the server we are 2 pirate players, and 2 legal players. We want to have mods and i've did some proofs in another server. When i put the mods in the server and on my Minecraft and i started the server, it did not let me in. I have activated all the options on server.properties, except for "Whitelist". The message on my Minecraft says "Failed to synchronize registry data from server, closing connection". In the Console says this: com.mojang.authlib.GameProfile@564b3dba[id=<null>,name=Benlly892,properties={},legacy=false]
I repeat, ALL the options, including Cracked are activated (except Whitelist), so i don't know why this is happening. The mods in singleplayer function perfectly, and i've checked that the mods on my Minecraft and on the server are the same.
I wish an answer and really sorry for my english, im from Spain.
Please someone help me !!!!