diff --git a/libi2pd/RouterInfo.cpp b/libi2pd/RouterInfo.cpp
index 0fc8c2dc..ad57f685 100644
--- a/libi2pd/RouterInfo.cpp
+++ b/libi2pd/RouterInfo.cpp
@@ -333,6 +333,21 @@ namespace data
 					}	
 					else 
 						supportedTransports |= eSSUV4; // in case if host or 6 caps is not preasented, we assume 4
+					if (address->ssu && !address->ssu->introducers.empty ())
+					{
+						// exclude invalid introducers
+						uint32_t ts = i2p::util::GetSecondsSinceEpoch ();
+						int numValid = 0;
+						for (auto& it: address->ssu->introducers)
+						{
+							if (ts <= it.iExp && it.iPort > 0 && 
+							    ((it.iHost.is_v4 () && address->IsV4 ()) || (it.iHost.is_v6 () && address->IsV6 ()))) 
+								numValid++;
+							else
+								it.iPort = 0;
+						}	
+						if (!numValid) address->ssu->introducers.resize (0);
+					}	
 				}	
 			}	
 			if (supportedTransports)
diff --git a/libi2pd/RouterInfo.h b/libi2pd/RouterInfo.h
index 46472bdf..336d7741 100644
--- a/libi2pd/RouterInfo.h
+++ b/libi2pd/RouterInfo.h
@@ -96,7 +96,7 @@ namespace data
 			typedef Tag<32> IntroKey; // should be castable to MacKey and AESKey
 			struct Introducer
 			{
-				Introducer (): iExp (0) {};
+				Introducer (): iPort (0), iExp (0) {};
 				boost::asio::ip::address iHost;
 				int iPort;
 				IntroKey iKey;
diff --git a/libi2pd/SSU.cpp b/libi2pd/SSU.cpp
index f8bdd9a0..b3118c96 100644
--- a/libi2pd/SSU.cpp
+++ b/libi2pd/SSU.cpp
@@ -431,16 +431,17 @@ namespace transport
 			return nullptr;
 	}
 
-	void SSUServer::CreateSession (std::shared_ptr<const i2p::data::RouterInfo> router, bool peerTest, bool v4only)
+	bool SSUServer::CreateSession (std::shared_ptr<const i2p::data::RouterInfo> router, bool peerTest, bool v4only)
 	{
 		auto address = router->GetSSUAddress (v4only || !context.SupportsV6 ());
 		if (address)
-			CreateSession (router, address, peerTest);
+			return CreateSession (router, address, peerTest);
 		else
 			LogPrint (eLogWarning, "SSU: Router ", i2p::data::GetIdentHashAbbreviation (router->GetIdentHash ()), " doesn't have SSU address");
+		return false;
 	}
 
-	void SSUServer::CreateSession (std::shared_ptr<const i2p::data::RouterInfo> router,
+	bool SSUServer::CreateSession (std::shared_ptr<const i2p::data::RouterInfo> router,
 		std::shared_ptr<const i2p::data::RouterInfo::Address> address, bool peerTest)
 	{
 		if (router && address)
@@ -449,10 +450,14 @@ namespace transport
 				m_Service.post (std::bind (&SSUServer::CreateSessionThroughIntroducer, this, router, address, peerTest)); // always V4 thread
 			else
 			{
+				if (address->host.is_unspecified ()) return false;	
 				boost::asio::ip::udp::endpoint remoteEndpoint (address->host, address->port);
 				m_Service.post (std::bind (&SSUServer::CreateDirectSession, this, router, remoteEndpoint, peerTest));
 			}
 		}
+		else
+			return false;
+		return true;
 	}
 
 	void SSUServer::CreateDirectSession (std::shared_ptr<const i2p::data::RouterInfo> router, boost::asio::ip::udp::endpoint remoteEndpoint, bool peerTest)
@@ -511,6 +516,7 @@ namespace transport
 				for (int i = 0; i < numIntroducers; i++)
 				{
 					auto intr = &(address->ssu->introducers[i]);
+					if (!intr->iPort) continue; // skip invalid introducer
 					if (intr->iExp > 0 && ts > intr->iExp) continue; // skip expired introducer
 					boost::asio::ip::udp::endpoint ep (intr->iHost, intr->iPort);
 					if (ep.address ().is_v4 () && address->IsV4 ()) // ipv4 
diff --git a/libi2pd/SSU.h b/libi2pd/SSU.h
index daaa83f3..606651d7 100644
--- a/libi2pd/SSU.h
+++ b/libi2pd/SSU.h
@@ -51,8 +51,8 @@ namespace transport
 			~SSUServer ();
 			void Start ();
 			void Stop ();
-			void CreateSession (std::shared_ptr<const i2p::data::RouterInfo> router, bool peerTest = false, bool v4only = false);
-			void CreateSession (std::shared_ptr<const i2p::data::RouterInfo> router,
+			bool CreateSession (std::shared_ptr<const i2p::data::RouterInfo> router, bool peerTest = false, bool v4only = false);
+			bool CreateSession (std::shared_ptr<const i2p::data::RouterInfo> router,
 				std::shared_ptr<const i2p::data::RouterInfo::Address> address, bool peerTest = false);
 			void CreateDirectSession (std::shared_ptr<const i2p::data::RouterInfo> router, boost::asio::ip::udp::endpoint remoteEndpoint, bool peerTest);
 			std::shared_ptr<SSUSession> FindSession (std::shared_ptr<const i2p::data::RouterInfo> router) const;
diff --git a/libi2pd/Transports.cpp b/libi2pd/Transports.cpp
index 13c1d210..cf136608 100644
--- a/libi2pd/Transports.cpp
+++ b/libi2pd/Transports.cpp
@@ -505,8 +505,8 @@ namespace transport
 					}
 					if (address && address->IsReachableSSU ())
 					{
-						m_SSUServer->CreateSession (peer.router, address);
-						return true;
+						if (m_SSUServer->CreateSession (peer.router, address))
+							return true;
 					}	
 				}
 				else