diff --git a/server/src/crypto/bfish.hpp b/server/src/crypto/bfish.hpp
index 68842d8..7747258 100644
--- a/server/src/crypto/bfish.hpp
+++ b/server/src/crypto/bfish.hpp
@@ -9,7 +9,7 @@ namespace sosc {
 namespace cgc {
 class Blowfish {
 public:
-    Blowfish(const std::string& key);
+    explicit Blowfish(const std::string& key);
     
     std::string Encrypt(std::string data) const;
     std::string Decrypt(std::string data) const;
diff --git a/server/src/crypto/cipher.cpp b/server/src/crypto/cipher.cpp
index 3d85299..a6ab929 100644
--- a/server/src/crypto/cipher.cpp
+++ b/server/src/crypto/cipher.cpp
@@ -9,11 +9,10 @@ static void _swap(T& a, T& b) {
 
 sosc::cgc::Cipher::Cipher(const KeyExchange& key) {
     std::string key_raw 
-        = key.GetPrivateKey().ToRawString(key.key_size_bytes);
-        
-    this->state = std::string(256, 0);
+        = key.GetPrivateKey().ToRawString((uint64_t)key.key_size_bytes);
+
     for(int i = 0; i < this->state_size; ++i)
-        this->state[i] = i;
+        this->state[i] = (uint8_t)i;
     
     int i = 0, j = 0;
     for(i = 0; i < this->state_size; ++i)
@@ -22,9 +21,11 @@ sosc::cgc::Cipher::Cipher(const KeyExchange& key) {
     GenerateStream(1024);
 }
 
-void sosc::cgc::Cipher::Parse(std::string* data) {
-    std::string stream = this->GenerateStream(data->length());
-    for(std::string::size_type i = 0; i < data->length(); ++i)
+void sosc::cgc::Cipher::Parse
+    (std::string* data, std::string::size_type offset)
+{
+    std::string stream = this->GenerateStream(data->length() - offset);
+    for(std::string::size_type i = offset; i < data->length(); ++i)
         (*data)[i] ^= stream[i];
 }
 
diff --git a/server/src/crypto/cipher.hpp b/server/src/crypto/cipher.hpp
index 5fedff9..aa0b8c2 100644
--- a/server/src/crypto/cipher.hpp
+++ b/server/src/crypto/cipher.hpp
@@ -8,15 +8,15 @@ namespace sosc {
 namespace cgc {
 class Cipher {
 public:
-    Cipher() {};
-    Cipher(const KeyExchange& key);
+    Cipher() = default;
+    explicit Cipher(const KeyExchange& key);
     
-    void Parse(std::string* data);
+    void Parse(std::string* data, std::string::size_type offset = 0);
 private:
     std::string GenerateStream(uint64_t length);
     
     const int state_size = 256;
-    std::string state;
+    uint8_t state[state_size];
 };
 }}
 
diff --git a/server/src/hosts/master_intra.cpp b/server/src/hosts/master_intra.cpp
index cc372f4..655329d 100644
--- a/server/src/hosts/master_intra.cpp
+++ b/server/src/hosts/master_intra.cpp
@@ -106,6 +106,7 @@ bool sosc::MasterIntra::InitAttempt(sosc::Packet &pck) {
         return this->Close(
             Packet(kEncryptionError, { net::htonv<uint16_t>(0x101) }));
 
+
     this->sock.Send(response);
 }
 
@@ -150,6 +151,7 @@ bool sosc::MasterIntra::Authentication(sosc::Packet &pck) {
 
     _ctx.license_check_mtx.unlock();
 
+    this->sock.Send(Packet(kPositiveAck, { packetId }));
     this->license = pck[2];
     this->authed = true;
     return true;
diff --git a/server/src/sock/pool.hpp b/server/src/sock/pool.hpp
index fb8c756..fa9aaf8 100644
--- a/server/src/sock/pool.hpp
+++ b/server/src/sock/pool.hpp
@@ -49,7 +49,7 @@ private:
     
     class Stack {
     public:
-        Stack(Pool<T>* pool);
+        explicit Stack(Pool<T>* pool);
         Stack(const Stack&) = delete;
         
         void Start();
diff --git a/server/src/utils/net.cpp b/server/src/utils/net.cpp
index 9845582..bb71280 100644
--- a/server/src/utils/net.cpp
+++ b/server/src/utils/net.cpp
@@ -88,7 +88,7 @@ int sosc::net::IpAddress::ParseIPv6Part
         addrpart_t* ptr = 
             &(this->parts[from_start ? i : 8 - parts.size() + i]);
         std::string part = str::trim(parts[i]);
-        int part_len = part.length();
+        auto part_len = (int)part.length();
         if(part_len > 4 || part_len == 0)
             return -1;
         
@@ -98,32 +98,28 @@ int sosc::net::IpAddress::ParseIPv6Part
             continue;
         }
         
-        for(int i = 0; i < part_len; ++i) {
-            if(part[i] == '*') {
-                part[i] = '0';
-                ptr->second |= 1 << (part_len - i - 1);
-            } else if(!(part[i] >= 'a' && part[i] <= 'f')
-                   && !(part[i] >= 'A' && part[i] <= 'F')
-                   && !(part[i] >= '0' && part[i] <= '9'))
+        for(int j = 0; j < part_len; ++j) {
+            if(part[j] == '*') {
+                part[j] = '0';
+                ptr->second |= 1 << (part_len - j - 1);
+            } else if(!(part[j] >= 'a' && part[j] <= 'f')
+                   && !(part[j] >= 'A' && part[j] <= 'F')
+                   && !(part[j] >= '0' && part[j] <= '9'))
             {
                 return -1;
             }
         }
         
-        ptr->first = std::stoi(part, NULL, 16);
+        ptr->first = (uint16_t)std::stoi(part, nullptr, 16);
     }
     
-    return parts.size();
+    return (int)parts.size();
 }
 
 sosc::net::IpAddress::operator std::string () const {
     return this->ToString();
 }
 
-sosc::net::IpAddress::operator const char* () const {
-    return this->ToString().c_str();
-}
-
 std::string sosc::net::IpAddress::ToString(bool force_ipv6) const {
     // TODO THIS
     return "::";
diff --git a/server/src/utils/net.hpp b/server/src/utils/net.hpp
index 14ffb8b..1f6730c 100644
--- a/server/src/utils/net.hpp
+++ b/server/src/utils/net.hpp
@@ -56,7 +56,6 @@ public:
     bool Parse(const std::string& addr);
     
     operator std::string () const;
-    operator const char* () const;
     std::string ToString(bool force_ipv6 = false) const;
     
     bool operator == (const IpAddress& rhs) const;
@@ -112,7 +111,7 @@ T ntohv(std::string net_var, size_t offset = 0) {
         int i = is_big_endian()
             ? b : byte_count - b - 1;
             
-        ((uint8_t*)&host_var)[i] = net_var[offset + b];
+        ((uint8_t*)&host_var)[i] = (uint8_t)net_var[offset + b];
     }
     
     return host_var;