It seems my server is failing to start as it can't verify the forge version.
It looks like the URL is duplicated, but im unsure
[16:34:57] [System Warning] : Failed to get latest forge version data from http://files.minecraftforge.net/maven/net/minecraftforge/forge/maven-metadata.xml
[16:34:57] [Minecraft Error] : ArgumentException
[16:34:57] [Minecraft Error] : [0] (ArgumentException) : An item with the same key has already been added.
[16:34:57] [Minecraft Error] : at ThrowHelper.ThrowArgumentException(ExceptionResource resource)
at Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
at Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer)
at MinecraftModule.UpdateManager.<GetForgeUpdateData>()