diff --git a/Passepartout-iOS/AppDelegate.swift b/Passepartout-iOS/AppDelegate.swift
index 7872f6c5..82ea9bae 100644
--- a/Passepartout-iOS/AppDelegate.swift
+++ b/Passepartout-iOS/AppDelegate.swift
@@ -116,6 +116,10 @@ class AppDelegate: UIResponder, UIApplicationDelegate, UISplitViewControllerDele
             }
             nav.modalPresentationStyle = .formSheet
             root.present(nav, animated: true, completion: nil)
+        } catch ApplicationError.unsupportedConfiguration(let option) {
+            let alert = Macros.alert(L10n.Organizer.Sections.Hosts.header, L10n.Wizards.Host.Alerts.unsupported(option))
+            alert.addCancelAction(L10n.Global.ok)
+            root.present(alert, animated: true, completion: nil)
         } catch {
             let alert = Macros.alert(L10n.Organizer.Sections.Hosts.header, L10n.Wizards.Host.Alerts.parsing)
             alert.addCancelAction(L10n.Global.ok)
diff --git a/Passepartout/Resources/en.lproj/Localizable.strings b/Passepartout/Resources/en.lproj/Localizable.strings
index ba3bbda8..621bf82b 100644
--- a/Passepartout/Resources/en.lproj/Localizable.strings
+++ b/Passepartout/Resources/en.lproj/Localizable.strings
@@ -45,6 +45,7 @@
 "wizards.host.cells.title_input.placeholder" = "My Profile";
 "wizards.host.sections.existing.header" = "Existing profiles";
 "wizards.host.alerts.existing" = "A host profile with the same title already exists. Replace it?";
+"wizards.host.alerts.unsupported" = "The configuration file contains an unsupported option (%@).";
 "wizards.host.alerts.parsing" = "Unable to parse the provided configuration file.";
 
 "service.welcome.message" = "Welcome to Passepartout!\n\nUse the organizer to add a new profile.";
diff --git a/Passepartout/Sources/ApplicationError.swift b/Passepartout/Sources/ApplicationError.swift
index d3c89ce4..d99bf98a 100644
--- a/Passepartout/Sources/ApplicationError.swift
+++ b/Passepartout/Sources/ApplicationError.swift
@@ -25,7 +25,7 @@
 
 import Foundation
 
-enum ApplicationError: String, Error {
+enum ApplicationError: Error {
     case missingProfile
 
     case missingCredentials
@@ -40,5 +40,5 @@ enum ApplicationError: String, Error {
 
     case emptyRemotes
     
-    case unsupportedConfiguration
+    case unsupportedConfiguration(option: String)
 }
diff --git a/Passepartout/Sources/SwiftGen+Strings.swift b/Passepartout/Sources/SwiftGen+Strings.swift
index a86214ff..37b10b85 100644
--- a/Passepartout/Sources/SwiftGen+Strings.swift
+++ b/Passepartout/Sources/SwiftGen+Strings.swift
@@ -660,6 +660,10 @@ internal enum L10n {
         internal static let existing = L10n.tr("Localizable", "wizards.host.alerts.existing")
         /// Unable to parse the provided configuration file.
         internal static let parsing = L10n.tr("Localizable", "wizards.host.alerts.parsing")
+        /// The configuration file contains an unsupported option (%@).
+        internal static func unsupported(_ p1: String) -> String {
+          return L10n.tr("Localizable", "wizards.host.alerts.unsupported", p1)
+        }
       }
 
       internal enum Cells {
diff --git a/Passepartout/Sources/VPN/TunnelKitProvider+FileConfiguration.swift b/Passepartout/Sources/VPN/TunnelKitProvider+FileConfiguration.swift
index 9b2699f0..15a6a1ad 100644
--- a/Passepartout/Sources/VPN/TunnelKitProvider+FileConfiguration.swift
+++ b/Passepartout/Sources/VPN/TunnelKitProvider+FileConfiguration.swift
@@ -113,11 +113,8 @@ extension TunnelKitProvider.Configuration {
                 case "key":
                     clientKey = CryptoContainer(pem: currentBlock.joined(separator: "\n"))
                     
-                case "tls-auth":
-                    unsupportedError = ApplicationError.unsupportedConfiguration
-                    
-                case "tls-crypt":
-                    unsupportedError = ApplicationError.unsupportedConfiguration
+                case "tls-auth", "tls-crypt":
+                    unsupportedError = ApplicationError.unsupportedConfiguration(option: blockName)
                     
                 default:
                     break
@@ -187,7 +184,7 @@ extension TunnelKitProvider.Configuration {
                 renegotiateAfterSeconds = Int(arg)
             }
             Regex.fragment.enumerateArguments(in: line) { (_) in
-                unsupportedError = ApplicationError.unsupportedConfiguration
+                unsupportedError = ApplicationError.unsupportedConfiguration(option: "fragment")
             }
 
             if let error = unsupportedError {