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Make sure you have the 1.1.1 Unleashed server files.
If you do and it still fails, take the LogisticsPipes.cfg from your client install of the pack and put it in the /config/ folder on your server. That should solve the ID conflict.
java.lang.IllegalArgumentException: Slot 1100 is already occupied by portalgun.common.block.BlockPortalMod@297f2f6b when adding logisticspipes.blocks.LogisticsSignBlock@5d022f15
at net.minecraft.block.Block.<init>(Block.java:340)