Couldn't look up profile properties for com.mojang.authlib.GameProfile@49b9740c[id=5ad55f34-41b6-4bd2-9c32-18983c635936,name=MHF_Spider,properties={},legacy=false]
com.mojang.authlib.exceptions.AuthenticationUnavailableException: Cannot contact authentication server
        at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:71) ~[server-1.7.10.jar:?]
        at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.fillProfileProperties(YggdrasilMinecraftSessionService.java:135) [server-1.7.10.jar:?]
        at net.minecraft.tileentity.TileEntitySkull.func_152109_d(TileEntitySkull.java:104) [apn.class:?]
        at net.minecraft.tileentity.TileEntitySkull.func_152106_a(TileEntitySkull.java:79) [apn.class:?]
        at net.minecraft.item.ItemSkull.func_77648_a(ItemSkull.java:114) [aeb.class:?]
        at net.minecraftforge.common.ForgeHooks.onPlaceItemIntoWorld(ForgeHooks.java:535) [ForgeHooks.class:1.7.10-1614.UNOFFICIAL]
        at net.minecraft.item.ItemStack.func_77943_a(ItemStack.java:164) [add.class:?]
        at net.minecraft.server.management.ItemInWorldManager.func_73078_a(ItemInWorldManager.java:498) [mx.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147346_a(NetHandlerPlayServer.java:861) [nh.class:?]
        at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:60) [jo.class:?]
        at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:9) [jo.class:?]
        at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:245) [ej.class:?]
        at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:181) [nc.class:?]
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:1023) [MinecraftServer.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:432) [lt.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:841) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:693) [MinecraftServer.class:?]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_171]
Caused by: java.net.SocketTimeoutException: Read timed out
        at java.net.SocketInputStream.socketRead0(Native Method) ~[?:1.8.0_171]
        at java.net.SocketInputStream.socketRead(SocketInputStream.java:116) ~[?:1.8.0_171]
        at java.net.SocketInputStream.read(SocketInputStream.java:171) ~[?:1.8.0_171]
        at java.net.SocketInputStream.read(SocketInputStream.java:141) ~[?:1.8.0_171]
        at sun.security.ssl.InputRecord.readFully(InputRecord.java:465) ~[?:1.8.0_171]
        at sun.security.ssl.InputRecord.read(InputRecord.java:503) ~[?:1.8.0_171]
        at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:983) ~[?:1.8.0_171]
        at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1385) ~[?:1.8.0_171]
        at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1413) ~[?:1.8.0_171]
        at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1397) ~[?:1.8.0_171]
        at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:559) ~[?:1.8.0_171]
        at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185) ~[?:1.8.0_171]
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1564) ~[?:1.8.0_171]
        at sun.net.www.protocol.http.HttpURLConnection.access$200(HttpURLConnection.java:91) ~[?:1.8.0_171]
        at sun.net.www.protocol.http.HttpURLConnection$9.run(HttpURLConnection.java:1484) ~[?:1.8.0_171]
        at sun.net.www.protocol.http.HttpURLConnection$9.run(HttpURLConnection.java:1482) ~[?:1.8.0_171]
        at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_171]
        at java.security.AccessController.doPrivilegedWithCombiner(AccessController.java:782) ~[?:1.8.0_171]
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1481) ~[?:1.8.0_171]
        at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:263) ~[?:1.8.0_171]
        at com.mojang.authlib.HttpAuthenticationService.performGetRequest(HttpAuthenticationService.java:126) ~[server-1.7.10.jar:?]
        at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:54) ~[server-1.7.10.jar:?]
        ... 17 more

我觉着可能是核心问题(滑稽)

登录插件的问题 和网络也有关系

第一行的
Couldn't look up profile properties for com.mojang.authlib.GameProfile ........ name=MHF_Spider
说明无法连接到mojang的皮肤站获取Spider(蜘蛛)头的皮肤。最近都是这个问题，可能是mojang服务器的皮肤站升级了导致的

我也这样，不知道啥原因

有解决办法吗。。