diff --git a/src/main/scala/li/cil/oc/common/tileentity/Microcontroller.scala b/src/main/scala/li/cil/oc/common/tileentity/Microcontroller.scala
index 3c0efc161..a4237eefc 100644
--- a/src/main/scala/li/cil/oc/common/tileentity/Microcontroller.scala
+++ b/src/main/scala/li/cil/oc/common/tileentity/Microcontroller.scala
@@ -52,6 +52,8 @@ class Microcontroller extends traits.PowerAcceptor with traits.Hub with traits.C
   @SideOnly(Side.CLIENT)
   override def canConnect(side: ForgeDirection) = side != facing
 
+  override def sidedNode(side: ForgeDirection): Node = if (side != facing) super.sidedNode(side) else null
+
   @SideOnly(Side.CLIENT)
   override protected def hasConnector(side: ForgeDirection) = side != facing
 
@@ -173,7 +175,7 @@ class Microcontroller extends traits.PowerAcceptor with traits.Hub with traits.C
 
   override def onMessage(message: Message): Unit = {
     if (message.source.network == snooperNode.network) {
-      for (side <- ForgeDirection.VALID_DIRECTIONS if outputSides(side.ordinal)) {
+      for (side <- ForgeDirection.VALID_DIRECTIONS if outputSides(side.ordinal) && side != facing) {
         sidedNode(side).sendToReachable(message.name, message.data: _*)
       }
     }
diff --git a/src/main/scala/li/cil/oc/common/tileentity/ServerRack.scala b/src/main/scala/li/cil/oc/common/tileentity/ServerRack.scala
index 2710af46e..53e02803a 100644
--- a/src/main/scala/li/cil/oc/common/tileentity/ServerRack.scala
+++ b/src/main/scala/li/cil/oc/common/tileentity/ServerRack.scala
@@ -74,6 +74,8 @@ class ServerRack extends traits.PowerAcceptor with traits.Hub with traits.PowerB
 
   override def canConnect(side: ForgeDirection) = side != facing
 
+  override def sidedNode(side: ForgeDirection): Node = if (side != facing) super.sidedNode(side) else null
+
   @Method(modid = Mods.IDs.StargateTech2)
   override def getInterfaces(side: Int) = if (side != facing.ordinal) {
     super.getInterfaces(side)
@@ -133,7 +135,7 @@ class ServerRack extends traits.PowerAcceptor with traits.Hub with traits.PowerB
     sides(number) match {
       case Some(serverSide) =>
         val serverNode = server.machine.node
-        for (side <- ForgeDirection.VALID_DIRECTIONS) {
+        for (side <- ForgeDirection.VALID_DIRECTIONS if side != facing) {
           if (toLocal(side) == serverSide) sidedNode(side).connect(serverNode)
           else sidedNode(side).disconnect(serverNode)
         }
diff --git a/src/main/scala/li/cil/oc/common/tileentity/traits/PowerBalancer.scala b/src/main/scala/li/cil/oc/common/tileentity/traits/PowerBalancer.scala
index cd006867d..28f4b114b 100644
--- a/src/main/scala/li/cil/oc/common/tileentity/traits/PowerBalancer.scala
+++ b/src/main/scala/li/cil/oc/common/tileentity/traits/PowerBalancer.scala
@@ -62,6 +62,6 @@ trait PowerBalancer extends PowerInformation with SidedEnvironment {
 
   private def isPrimary(connector: Connector) = {
     val nodes = connectors
-    connector != null && nodes(nodes.indexWhere(_.network == connector.network)) == connector
+    connector != null && nodes(nodes.indexWhere(node => node != null && node.network == connector.network)) == connector
   }
 }