Merge pull request #3620 from BaronGreenback/IPFix

Fix for #3607 and #3515

(cherry picked from commit 0750357916b600a4b4c27bc4babd2adcc6390473)
Signed-off-by: Joshua M. Boniface <joshua@boniface.me>

Emby.Server.Implementations/Networking/NetworkManager.cs

@@ -152,7 +152,12 @@ namespace Emby.Server.Implementations.Networking
                 return true;
             }
 
-            byte[] octet = IPAddress.Parse(endpoint).GetAddressBytes();
+            if (!IPAddress.TryParse(endpoint, out var ipAddress))
+            {
+                return false;
+            }
+
+            byte[] octet = ipAddress.GetAddressBytes();
 
             if ((octet[0] == 10) ||
                 (octet[0] == 172 && (octet[1] >= 16 && octet[1] <= 31)) || // RFC1918
@@ -268,6 +273,12 @@ namespace Emby.Server.Implementations.Networking
             string excludeAddress = "[" + addressString + "]";
             var subnets = LocalSubnetsFn();
 
+            // Include any address if LAN subnets aren't specified
+            if (subnets.Length == 0)
+            {
+                return true;
+            }
+
             // Exclude any addresses if they appear in the LAN list in [ ]
             if (Array.IndexOf(subnets, excludeAddress) != -1)
             {