diff --git a/src/net/grunt/ClientLink.cpp b/src/net/grunt/ClientLink.cpp
index c29874c..e202181 100644
--- a/src/net/grunt/ClientLink.cpp
+++ b/src/net/grunt/ClientLink.cpp
@@ -233,8 +233,40 @@ int32_t Grunt::ClientLink::CmdAuthLogonProof(CDataStore& msg) {
     }
 
     // Auth success
+    if (msg.m_read <= msg.m_size && msg.m_size - msg.m_read >= 24) {
+        void* serverProof;
+        msg.GetDataInSitu(serverProof, 20);
 
-    // TODO
+        uint32_t v17 = 0;
+        msg.Get(v17);
+
+        uint32_t v14;
+        msg.Get(v14);
+
+        if (msg.m_read <= msg.m_size && msg.m_size - msg.m_read >= 2) {
+            uint16_t v16 = 0;
+            msg.Get(v16);
+
+            if (msg.m_read <= msg.m_size) {
+                if (this->m_srpClient.VerifyServerProof(static_cast<uint8_t*>(serverProof), 20)) {
+                    this->SetState(2);
+                    this->m_clientResponse->LogonResult(Grunt::GRUNT_RESULT_11, nullptr, 0, 0);
+                } else {
+                    // TODO
+                    // this->uint98 = v17;
+                    // this->uint94 = 0;
+                    // this->uint9C = v14;
+
+                    this->SetState(6);
+                    this->m_clientResponse->LogonResult(Grunt::GRUNT_RESULT_0, this->m_srpClient.sessionKey, 40, v16);
+                }
+
+                return 2;
+            }
+
+            return 1;
+        }
+    }
 
     return 0;
 }
diff --git a/src/net/srp/SRP6_Client.cpp b/src/net/srp/SRP6_Client.cpp
index 43db5e6..feee07c 100644
--- a/src/net/srp/SRP6_Client.cpp
+++ b/src/net/srp/SRP6_Client.cpp
@@ -174,3 +174,16 @@ cleanup:
 
     return result;
 }
+
+int32_t SRP6_Client::VerifyServerProof(const uint8_t* serverProof, uint32_t serverProofLen) {
+    if (serverProofLen != 20) {
+        return -2;
+    }
+
+    // Calculate expected server proof
+    uint8_t localServerProof[SHA1_DIGEST_SIZE];
+    SHA1_Final(localServerProof, &this->ctx);
+
+    // Compare expected server proof with given server proof
+    return memcmp(localServerProof, serverProof, sizeof(localServerProof));
+}
diff --git a/src/net/srp/SRP6_Client.hpp b/src/net/srp/SRP6_Client.hpp
index 1787cce..e8b76c1 100644
--- a/src/net/srp/SRP6_Client.hpp
+++ b/src/net/srp/SRP6_Client.hpp
@@ -18,6 +18,7 @@ class SRP6_Client {
     // Member functions
     int32_t BeginAuthentication(const char* accountName, const char* password);
     int32_t CalculateProof(const uint8_t* largeSafePrime, uint32_t largeSafePrimeLen, const uint8_t* generator, uint32_t generatorLen, const uint8_t* salt, uint32_t saltLen, const uint8_t* publicKey, uint32_t publicKeyLen, SRP6_Random& random);
+    int32_t VerifyServerProof(const uint8_t* serverProof, uint32_t serverProofLen);
 };
 
 #endif