diff --git a/mirai-core/src/main/java/net/mamoe/mirai/network/packet/client/ClientPacket.kt b/mirai-core/src/main/java/net/mamoe/mirai/network/packet/client/ClientPacket.kt
index 6c43f9802..a39bcdb66 100644
--- a/mirai-core/src/main/java/net/mamoe/mirai/network/packet/client/ClientPacket.kt
+++ b/mirai-core/src/main/java/net/mamoe/mirai/network/packet/client/ClientPacket.kt
@@ -107,7 +107,8 @@ fun Int.toByteArray(): ByteArray = byteArrayOf(//todo 检查这方法对不对,
         (this.ushr(0) and 0xFF).toByte()
 )
 
-fun Int.toHexString(separator: String = " "): String = this.toByteArray().toHexString(separator);
+@ExperimentalUnsignedTypes
+fun Int.toHexString(separator: String = " "): String = this.toByteArray().toUByteArray().toHexString(separator);
 
 private fun md5(str: String): ByteArray = MessageDigest.getInstance("MD5").digest(str.toByteArray())
 
diff --git a/mirai-core/src/main/java/net/mamoe/mirai/network/packet/server/Server0825Packet.kt b/mirai-core/src/main/java/net/mamoe/mirai/network/packet/server/Server0825Packet.kt
index ce364b602..6ab9be2ae 100644
--- a/mirai-core/src/main/java/net/mamoe/mirai/network/packet/server/Server0825Packet.kt
+++ b/mirai-core/src/main/java/net/mamoe/mirai/network/packet/server/Server0825Packet.kt
@@ -38,7 +38,7 @@ class Server0825Packet(private val type: Type, inputStream: DataInputStream) : S
             0X00 -> {
                 data.skip(4)
                 token = data.readNBytes(56)
-                data.skip(28)
+                data.skip(6)
 
                 loginTime = data.readInt()
                 loginIP = data.readIP()
diff --git a/mirai-core/src/main/java/net/mamoe/mirai/network/packet/server/ServerPacket.kt b/mirai-core/src/main/java/net/mamoe/mirai/network/packet/server/ServerPacket.kt
index 7cb413827..28f14998c 100644
--- a/mirai-core/src/main/java/net/mamoe/mirai/network/packet/server/ServerPacket.kt
+++ b/mirai-core/src/main/java/net/mamoe/mirai/network/packet/server/ServerPacket.kt
@@ -1,6 +1,7 @@
 package net.mamoe.mirai.network.packet.server
 
 import net.mamoe.mirai.network.packet.Packet
+import net.mamoe.mirai.network.packet.client.toHexString
 import net.mamoe.mirai.util.toHexString
 
 import java.io.DataInputStream
@@ -49,9 +50,11 @@ fun DataInputStream.readUntil(byte: Byte): ByteArray {
 @ExperimentalUnsignedTypes
 fun DataInputStream.readIP(): String {
     var buff = ""
-    for (i in 0..3) {//todo: check t// hat
-        buff += (readByte().toInt()).toString()
+    for (i in 0..3) {
+        val byte = readByte();
+        buff += (byte.toUByte().toString())
         if(i !=3)buff+="."
+        System.out.println(byte.toHexString())
     }
     return buff
 }
diff --git a/mirai-core/src/main/java/net/mamoe/mirai/util/Utils.kt b/mirai-core/src/main/java/net/mamoe/mirai/util/Utils.kt
index de6afc57a..5b9eea91c 100644
--- a/mirai-core/src/main/java/net/mamoe/mirai/util/Utils.kt
+++ b/mirai-core/src/main/java/net/mamoe/mirai/util/Utils.kt
@@ -32,7 +32,8 @@ fun ByteArray.toHexString(separator: String = " "): String = Utils.toHexString(t
 @ExperimentalUnsignedTypes
 fun UByteArray.toHexString(separator: String = " "): String = Utils.toHexString(this, separator)
 
-fun Byte.toHexString(): String = this.toString(16)
+@ExperimentalUnsignedTypes
+fun Byte.toHexString(): String = this.toUByte().toString(16)
 
 
 
diff --git a/mirai-core/src/test/java/PacketTest.kt b/mirai-core/src/test/java/PacketTest.kt
index 31321c903..423d771d5 100644
--- a/mirai-core/src/test/java/PacketTest.kt
+++ b/mirai-core/src/test/java/PacketTest.kt
@@ -1,4 +1,4 @@
-import net.mamoe.mirai.network.packet.client.Client0825ResponsePacket
+import net.mamoe.mirai.network.packet.client.toHexString
 import net.mamoe.mirai.network.packet.server.Server0825Packet
 import net.mamoe.mirai.util.TEACryptor
 import net.mamoe.mirai.util.hexToBytes
@@ -13,6 +13,6 @@ fun main(){
     val packet = Server0825Packet(Server0825Packet.Type.TYPE_08_25_31_01,s)
     packet.decode()
     System.out.println(packet.token.toUByteArray().toHexString(" "))
-    System.out.println(packet.loginTime)
+    System.out.println(packet.loginTime.toHexString(" "))
     System.out.println(packet.loginIP)
 }
\ No newline at end of file