diff --git a/pcsx2/DEV9/Sessions/TCP_Session/TCP_Session.cpp b/pcsx2/DEV9/Sessions/TCP_Session/TCP_Session.cpp
index 3c1d8965cb..ee57d04867 100644
--- a/pcsx2/DEV9/Sessions/TCP_Session/TCP_Session.cpp
+++ b/pcsx2/DEV9/Sessions/TCP_Session/TCP_Session.cpp
@@ -81,9 +81,9 @@ namespace Sessions
 		ret->destinationPort = srcPort;
 
 		ret->sequenceNumber = GetMyNumber();
-		//DevCon.WriteLn("With MySeq: %d", ret->sequenceNumber);
+		//DevCon.WriteLn("With MySeq: %u", ret->sequenceNumber);
 		ret->acknowledgementNumber = expectedSeqNumber;
-		//DevCon.WriteLn("With MyAck: %d", ret->acknowledgementNumber);
+		//DevCon.WriteLn("With MyAck: %u", ret->acknowledgementNumber);
 
 		ret->windowSize = 2 * maxSegmentSize;
 
diff --git a/pcsx2/DEV9/Sessions/TCP_Session/TCP_Session_In.cpp b/pcsx2/DEV9/Sessions/TCP_Session/TCP_Session_In.cpp
index 138ab13c0e..4fce5d68c2 100644
--- a/pcsx2/DEV9/Sessions/TCP_Session/TCP_Session_In.cpp
+++ b/pcsx2/DEV9/Sessions/TCP_Session/TCP_Session_In.cpp
@@ -80,7 +80,9 @@ namespace Sessions
 			int err = 0;
 			int recived;
 
-			unsigned long available;
+			//FIONREAD uses unsigned long on windows and int on linux
+			//Zero init so we don't have bad data on any unused bytes
+			unsigned long available = 0;
 #ifdef _WIN32
 			err = ioctlsocket(client, FIONREAD, &available);
 #elif defined(__POSIX__)
@@ -89,7 +91,7 @@ namespace Sessions
 			if (err != SOCKET_ERROR)
 			{
 				if (available > maxSize)
-					Console.WriteLn("DEV9: TCP: Got a lot of data: %d Using: %d", available, maxSize);
+					Console.WriteLn("DEV9: TCP: Got a lot of data: %lu Using: %d", available, maxSize);
 
 				buffer = std::make_unique<u8[]>(maxSize);
 				recived = recv(client, (char*)buffer.get(), maxSize, 0);
diff --git a/pcsx2/DEV9/Sessions/TCP_Session/TCP_Session_Out.cpp b/pcsx2/DEV9/Sessions/TCP_Session/TCP_Session_Out.cpp
index bebfab067e..db1fce3168 100644
--- a/pcsx2/DEV9/Sessions/TCP_Session/TCP_Session_Out.cpp
+++ b/pcsx2/DEV9/Sessions/TCP_Session/TCP_Session_Out.cpp
@@ -361,7 +361,7 @@ namespace Sessions
 				//Done send
 			}
 			//ACK data
-			//DevCon.WriteLn("[SRV] ACK Data: %d", expectedSeqNumber);
+			//DevCon.WriteLn("[SRV] ACK Data: %u", expectedSeqNumber);
 			TCP_Packet* ret = CreateBasePacket();
 			ret->SetACK(true);
 
@@ -402,11 +402,11 @@ namespace Sessions
 	TCP_Session::NumCheckResult TCP_Session::CheckRepeatSYNNumbers(TCP_Packet* tcp)
 	{
 		//DevCon.WriteLn("DEV9: TCP: CHECK_REPEAT_SYN_NUMBERS");
-		//DevCon.WriteLn("DEV9: TCP: [SRV]CurrAckNumber = %d [PS2]Seq Number = %d", expectedSeqNumber, tcp->sequenceNumber);
+		//DevCon.WriteLn("DEV9: TCP: [SRV] CurrAckNumber = %u [PS2] Seq Number = %u", expectedSeqNumber, tcp->sequenceNumber);
 
 		if (tcp->sequenceNumber != expectedSeqNumber - 1)
 		{
-			Console.Error("DEV9: TCP: [PS2] Sent Unexpected Sequence Number From Repeated SYN Packet, Got %d Expected %d", tcp->sequenceNumber, (expectedSeqNumber - 1));
+			Console.Error("DEV9: TCP: [PS2] Sent Unexpected Sequence Number From Repeated SYN Packet, Got %u Expected %u", tcp->sequenceNumber, (expectedSeqNumber - 1));
 			return NumCheckResult::Bad;
 		}
 		return NumCheckResult::OK;
@@ -419,24 +419,24 @@ namespace Sessions
 		std::tie(seqNum, oldSeqNums) = GetAllMyNumbers();
 
 		//DevCon.WriteLn("DEV9: TCP: CHECK_NUMBERS");
-		//DevCon.WriteLn("DEV9: TCP: [SRV]CurrSeqNumber = %d [PS2]Ack Number = %d", seqNum, tcp->acknowledgementNumber);
-		//DevCon.WriteLn("DEV9: TCP: [SRV]CurrAckNumber = %d [PS2]Seq Number = %d", expectedSeqNumber, tcp->sequenceNumber);
-		//DevCon.WriteLn("DEV9: TCP: [PS2]Data Length = %d",  tcp->GetPayload()->GetLength());
+		//DevCon.WriteLn("DEV9: TCP: [SRV] CurrSeqNumber = %u [PS2] Ack Number = %u", seqNum, tcp->acknowledgementNumber);
+		//DevCon.WriteLn("DEV9: TCP: [SRV] CurrAckNumber = %u [PS2] Seq Number = %u", expectedSeqNumber, tcp->sequenceNumber);
+		//DevCon.WriteLn("DEV9: TCP: [PS2] Data Length = %u",  tcp->GetPayload()->GetLength());
 
 		if (tcp->acknowledgementNumber != seqNum)
 		{
-			//DevCon.WriteLn("DEV9: TCP: [PS2]Sent Outdated Acknowledgement Number, Got %d Expected %d", tcp->acknowledgementNumber, seqNum);
+			//DevCon.WriteLn("DEV9: TCP: [PS2] Sent Outdated Acknowledgement Number, Got %u Expected %u", tcp->acknowledgementNumber, seqNum);
 
 			//Check if oldSeqNums contains tcp->acknowledgementNumber
 			if (std::find(oldSeqNums.begin(), oldSeqNums.end(), tcp->acknowledgementNumber) == oldSeqNums.end())
 			{
-				Console.Error("DEV9: TCP: [PS2] Sent Unexpected Acknowledgement Number, did not Match Old Numbers, Got %d Expected %d", tcp->acknowledgementNumber, seqNum);
+				Console.Error("DEV9: TCP: [PS2] Sent Unexpected Acknowledgement Number, did not Match Old Numbers, Got %u Expected %u", tcp->acknowledgementNumber, seqNum);
 				return NumCheckResult::Bad;
 			}
 		}
 		else
 		{
-			//DevCon.WriteLn("[PS2]CurrSeqNumber Acknowleged By PS2");
+			//DevCon.WriteLn("[PS2] CurrSeqNumber Acknowleged By PS2");
 			myNumberACKed.store(true);
 		}
 
@@ -444,19 +444,19 @@ namespace Sessions
 		{
 			if (tcp->GetPayload()->GetLength() == 0)
 			{
-				Console.Error("DEV9: TCP: [PS2] Sent Unexpected Sequence Number From ACK Packet, Got %d Expected %d", tcp->sequenceNumber, expectedSeqNumber);
+				Console.Error("DEV9: TCP: [PS2] Sent Unexpected Sequence Number From ACK Packet, Got %u Expected %u", tcp->sequenceNumber, expectedSeqNumber);
 			}
 			else
 			{
 				//Check if receivedPS2SeqNumbers contains tcp->sequenceNumber
 				if (std::find(receivedPS2SeqNumbers.begin(), receivedPS2SeqNumbers.end(), tcp->sequenceNumber) == receivedPS2SeqNumbers.end())
 				{
-					Console.Error("DEV9: TCP: [PS2] Sent an Old Seq Number on an Data packet, Got %d Expected %d", tcp->sequenceNumber, expectedSeqNumber);
+					Console.Error("DEV9: TCP: [PS2] Sent an Old Seq Number on an Data packet, Got %u Expected %u", tcp->sequenceNumber, expectedSeqNumber);
 					return NumCheckResult::GotOldData;
 				}
 				else
 				{
-					Console.Error("DEV9: TCP: [PS2] Sent Unexpected Sequence Number From Data Packet, Got %d Expected %d", tcp->sequenceNumber, expectedSeqNumber);
+					Console.Error("DEV9: TCP: [PS2] Sent Unexpected Sequence Number From Data Packet, Got %u Expected %u", tcp->sequenceNumber, expectedSeqNumber);
 					return NumCheckResult::Bad;
 				}
 			}