diff --git a/src/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackClient.Commands.SKJOIN_SKREJOIN.cs b/src/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackClient.Commands.SKJOIN_SKREJOIN.cs
index b9fea30..4c843e4 100644
--- a/src/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackClient.Commands.SKJOIN_SKREJOIN.cs
+++ b/src/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackClient.Commands.SKJOIN_SKREJOIN.cs
@@ -13,6 +13,18 @@ namespace Smdn.Net.SkStackIP;
 #pragma warning disable IDE0040
 partial class SkStackClient {
 #pragma warning restore IDE0040
+  private static SkStackPanaSessionEstablishmentException CreatePanaSessionEstablishmentException(
+    IPAddress paaAddress,
+    SkStackEventNumber eventNumber,
+    IPAddress address
+  )
+    => new(
+      message: null,
+      paaAddress: paaAddress,
+      address: address,
+      eventNumber: eventNumber
+    );
+
   /// <summary>
   ///   <para>Sends a command <c>SKJOIN</c>.</para>
   /// </summary>
@@ -22,6 +34,17 @@ partial class SkStackClient {
   public ValueTask<SkStackResponse> SendSKJOINAsync(
     IPAddress ipv6address,
     CancellationToken cancellationToken = default
+  )
+    => SendSKJOINAsync(
+      ipv6address: ipv6address,
+      createPanaSessionEstablishmentException: (eventNumber, address) => CreatePanaSessionEstablishmentException(ipv6address, eventNumber, address),
+      cancellationToken: cancellationToken
+    );
+
+  internal ValueTask<SkStackResponse> SendSKJOINAsync(
+    IPAddress ipv6address,
+    Func<SkStackEventNumber, IPAddress, Exception>? createPanaSessionEstablishmentException,
+    CancellationToken cancellationToken
   )
   {
     if (ipv6address is null)
@@ -29,11 +52,15 @@ public ValueTask<SkStackResponse> SendSKJOINAsync(
     if (ipv6address.AddressFamily != AddressFamily.InterNetworkV6)
       throw new ArgumentException($"`{nameof(ipv6address)}.{nameof(IPAddress.AddressFamily)}` must be {nameof(AddressFamily.InterNetworkV6)}");
 
-    return SKJOIN(ipv6address, cancellationToken);
+    return SKJOIN(ipv6address, createPanaSessionEstablishmentException, cancellationToken);
 
-    async ValueTask<SkStackResponse> SKJOIN(IPAddress addr, CancellationToken ct)
+    async ValueTask<SkStackResponse> SKJOIN(
+      IPAddress addr,
+      Func<SkStackEventNumber, IPAddress, Exception>? createException,
+      CancellationToken ct
+    )
     {
-      var (response, _) = await SKJOIN_SKREJOIN(SkStackCommandNames.SKJOIN, addr, ct).ConfigureAwait(false);
+      var (response, _) = await SKJOIN_SKREJOIN(SkStackCommandNames.SKJOIN, addr, createException, ct).ConfigureAwait(false);
 
       return response;
     }
@@ -51,7 +78,12 @@ IPAddress Address
   )> SendSKREJOINAsync(
     CancellationToken cancellationToken = default
   )
-    => SKJOIN_SKREJOIN(SkStackCommandNames.SKREJOIN, ipv6address: null, cancellationToken);
+    => SKJOIN_SKREJOIN(
+      SkStackCommandNames.SKREJOIN,
+      ipv6address: null,
+      createPanaSessionEstablishmentException: null,
+      cancellationToken
+    );
 
   private async ValueTask<(
     SkStackResponse Response,
@@ -60,10 +92,11 @@ IPAddress Address
   SKJOIN_SKREJOIN(
     ReadOnlyMemory<byte> command,
     IPAddress? ipv6address,
+    Func<SkStackEventNumber, IPAddress, Exception>? createPanaSessionEstablishmentException,
     CancellationToken cancellationToken
   )
   {
-    var eventHandler = new SKJOINEventHandler();
+    var eventHandler = new SKJOINEventHandler(createPanaSessionEstablishmentException);
     var resp = await SendCommandAsync(
       command: command,
       writeArguments: writer => {
@@ -85,16 +118,20 @@ CancellationToken cancellationToken
     return (resp, eventHandler.Address!);
   }
 
-  private class SKJOINEventHandler : SkStackEventHandlerBase {
+  private sealed class SKJOINEventHandler(Func<SkStackEventNumber, IPAddress, Exception>? createPanaSessionEstablishmentException) : SkStackEventHandlerBase {
     public bool HasAddressSet { get; private set; }
     public IPAddress? Address { get; private set; }
 
+    private readonly Func<SkStackEventNumber, IPAddress, Exception>? createPanaSessionEstablishmentException = createPanaSessionEstablishmentException;
     private SkStackEventNumber eventNumber;
 
+    private static SkStackPanaSessionEstablishmentException CreatePanaSessionEstablishmentException(SkStackEventNumber eventNumber, IPAddress address)
+      => new(null, address, eventNumber);
+
     public void ThrowIfEstablishmentError()
     {
       if (eventNumber != SkStackEventNumber.PanaSessionEstablishmentCompleted)
-        throw new SkStackPanaSessionEstablishmentException($"PANA session establishment failed. (0x{eventNumber:X})", Address!, eventNumber);
+        throw createPanaSessionEstablishmentException?.Invoke(eventNumber, Address!) ?? CreatePanaSessionEstablishmentException(eventNumber, Address!);
     }
 
     public override bool TryProcessEvent(SkStackEvent ev)
diff --git a/src/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackClient.Functions.PANA.AuthenticateAsPaC.cs b/src/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackClient.Functions.PANA.AuthenticateAsPaC.cs
index 523cc2f..9499355 100644
--- a/src/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackClient.Functions.PANA.AuthenticateAsPaC.cs
+++ b/src/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackClient.Functions.PANA.AuthenticateAsPaC.cs
@@ -201,7 +201,7 @@ private static int ValidatePanIdAndThrowIfInvalid(int panId, string paramName)
   /// <seealso cref="SkStackRegister.PanId"/>
   /// <seealso cref="PanaSessionPeerAddress"/>
   /// <seealso cref="IsPanaSessionAlive"/>
-  /// <seealso cref="SendSKJOINAsync"/>
+  /// <seealso cref="SendSKJOINAsync(IPAddress, Func{SkStackEventNumber, IPAddress, Exception}?, CancellationToken)"/>
   /// <seealso cref="SendSKSETRBIDAsync(ReadOnlyMemory{byte}, CancellationToken)"/>
   /// <seealso cref="SendSKSETPWDAsync(ReadOnlyMemory{byte}, CancellationToken)"/>
   private async ValueTask<SkStackPanaSessionInfo> AuthenticateAsPanaClientAsyncCore(
@@ -344,6 +344,15 @@ await SendSKSREGAsync(
     // Then attempt to establish the PANA session.
     await SendSKJOINAsync(
       ipv6address: paaAddressNotNull,
+      createPanaSessionEstablishmentException: (eventNumber, address) =>
+        new SkStackPanaSessionEstablishmentException(
+          message: null,
+          paaAddress: paaAddressNotNull,
+          channel: channelNotNull,
+          panId: panIdNotNull,
+          address: address,
+          eventNumber: eventNumber
+        ),
       cancellationToken: cancellationToken
     ).ConfigureAwait(false);
 
diff --git a/src/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackPanaSessionEstablishmentException.cs b/src/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackPanaSessionEstablishmentException.cs
index 30a95f0..efd5bba 100644
--- a/src/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackPanaSessionEstablishmentException.cs
+++ b/src/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackPanaSessionEstablishmentException.cs
@@ -10,20 +10,69 @@ namespace Smdn.Net.SkStackIP;
 /// <summary>
 /// The exception that represents an error on the establishment of a PANA session.
 /// </summary>
-/// <seealso cref="SkStackClient.SendSKJOINAsync"/>
+/// <seealso cref="SkStackClient.SendSKJOINAsync(IPAddress, System.Threading.CancellationToken)"/>
 public class SkStackPanaSessionEstablishmentException : SkStackPanaSessionException {
+  /// <summary>Gets the <see cref="IPAddress"/> of the PANA Authentication Agent(PAA) that attempted PANA authentication.</summary>
+  public IPAddress? PaaAddress { get; }
+
+  /// <summary>Gets the channel number used when attempting to establish a PANA session.</summary>
+  /// <value>If this exception occurs as a result of the <see cref="SkStackClient.AuthenticateAsPanaClientAsync(ReadOnlyMemory{byte}, ReadOnlyMemory{byte}, IPAddress, SkStackChannel, int, System.Threading.CancellationToken)"/> method, the non-<see langword="null"/> value will be set to this property.　Otherwise, it will be <see langword="null"/>.</value>
+  public SkStackChannel? Channel { get; }
+
+  /// <summary>Gets the PAN ID used when attempting to establish a PANA session.</summary>
+  /// <value>If this exception occurs as a result of the <see cref="SkStackClient.AuthenticateAsPanaClientAsync(ReadOnlyMemory{byte}, ReadOnlyMemory{byte}, IPAddress, SkStackChannel, int, System.Threading.CancellationToken)"/> method, the non-<see langword="null"/> value will be set to this property.　Otherwise, it will be <see langword="null"/>.</value>
+  public int? PanId { get; }
+
+  internal SkStackPanaSessionEstablishmentException(
+    string? message,
+    IPAddress address,
+    SkStackEventNumber eventNumber,
+    Exception? innerException = null
+  )
+    : base(
+      message: message ?? $"PANA session establishment failed. (0x{eventNumber:X})",
+      address: address,
+      eventNumber: eventNumber,
+      innerException: innerException
+    )
+  {
+  }
+
+  internal SkStackPanaSessionEstablishmentException(
+    string? message,
+    IPAddress paaAddress,
+    IPAddress address,
+    SkStackEventNumber eventNumber,
+    Exception? innerException = null
+  )
+    : base(
+      message: message ?? $"PANA session establishment failed. (0x{eventNumber:X}, PAA={paaAddress})",
+      address: address,
+      eventNumber: eventNumber,
+      innerException: innerException
+    )
+  {
+    PaaAddress = paaAddress;
+  }
+
   internal SkStackPanaSessionEstablishmentException(
-    string message,
+    string? message,
+    IPAddress paaAddress,
+    SkStackChannel channel,
+    int panId,
     IPAddress address,
     SkStackEventNumber eventNumber,
     Exception? innerException = null
   )
     : base(
-      message: message,
+      message: message ?? $"PANA session establishment failed. (0x{eventNumber:X}, PAA={paaAddress}, Channel={channel}, PanID=0x{panId:X4})",
       address: address,
       eventNumber: eventNumber,
       innerException: innerException
     )
   {
+    PaaAddress = paaAddress;
+    Channel = channel;
+    PanId = panId;
   }
 }
diff --git a/tests/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackClient.Commands.3.4.SKJOIN.cs b/tests/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackClient.Commands.3.4.SKJOIN.cs
index e446ef8..9459fed 100644
--- a/tests/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackClient.Commands.3.4.SKJOIN.cs
+++ b/tests/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackClient.Commands.3.4.SKJOIN.cs
@@ -138,6 +138,9 @@ async Task RaisePanaSessionEstablishmentEventsAsync()
 
     Assert.That(ex!.EventNumber, Is.EqualTo(SkStackEventNumber.PanaSessionEstablishmentError));
     Assert.That(ex.Address, Is.EqualTo(IPAddress.Parse(SelfIPv6Address)));
+    Assert.That(ex.PaaAddress, Is.EqualTo(IPAddress.Parse(PaaIPv6Address)));
+    Assert.That(ex.Channel, Is.Null);
+    Assert.That(ex.PanId, Is.Null);
 
     Assert.That(raisedEventCount, Is.EqualTo(0), nameof(raisedEventCount));
 
diff --git a/tests/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackClient.Commands.3.5.SKREJOIN.cs b/tests/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackClient.Commands.3.5.SKREJOIN.cs
index efa445e..9886fac 100644
--- a/tests/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackClient.Commands.3.5.SKREJOIN.cs
+++ b/tests/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackClient.Commands.3.5.SKREJOIN.cs
@@ -132,6 +132,9 @@ async Task RaisePanaSessionEstablishmentEventsAsync()
 
     Assert.That(ex!.EventNumber, Is.EqualTo(SkStackEventNumber.PanaSessionEstablishmentError));
     Assert.That(ex.Address, Is.EqualTo(IPAddress.Parse(SelfIPv6Address)));
+    Assert.That(ex.PaaAddress, Is.Null);
+    Assert.That(ex.Channel, Is.Null);
+    Assert.That(ex.PanId, Is.Null);
 
     Assert.That(raisedEventCount, Is.EqualTo(0), nameof(raisedEventCount));
 
diff --git a/tests/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackClient.Functions.PANA.AuthenticateAsPaC.cs b/tests/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackClient.Functions.PANA.AuthenticateAsPaC.cs
index a6e0251..551ee68 100644
--- a/tests/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackClient.Functions.PANA.AuthenticateAsPaC.cs
+++ b/tests/Smdn.Net.SkStackIP/Smdn.Net.SkStackIP/SkStackClient.Functions.PANA.AuthenticateAsPaC.cs
@@ -96,7 +96,13 @@ ILogger logger
         cancellationToken: cts.Token
       ),
       exceptPanaSessionEstablishmentException
-        ? Throws.TypeOf<SkStackPanaSessionEstablishmentException>()
+        ? Throws
+            .TypeOf<SkStackPanaSessionEstablishmentException>()
+            .And.Property(nameof(SkStackPanaSessionEstablishmentException.PaaAddress)).EqualTo(IPAddress.Parse(paaIPv6Address))
+            .And.Property(nameof(SkStackPanaSessionEstablishmentException.Channel)).EqualTo(SkStackChannel.Channels[paaChannel])
+            .And.Property(nameof(SkStackPanaSessionEstablishmentException.PanId)).EqualTo(paaPanId)
+            .And.Property(nameof(SkStackPanaSessionEstablishmentException.EventNumber)).EqualTo(eventNumberOfPanaSessionEstablishment)
+            .And.Property(nameof(SkStackPanaSessionEstablishmentException.Address)).EqualTo(IPAddress.Parse(selfIPv6Address))
         : Throws.Nothing
     );