Server says java.io.BufferdOutputStream.flush/flushBuffer

Hello,

I'm coming from Germany, so sorry for bad english words!
We are not play illegal, we play in a private Network, that is the reason, that we play in offline mode!

My problem is that people in about 20-30 minutes always get error messages. Can you help me solve this problem? Here is my server log:

Code:

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14:30:31 [INFO] Starting minecraft server version Beta 1.6.6
14:30:31 [INFO] Loading properties
14:30:31 [INFO] Starting Minecraft server on 5.82.225.185:25565
14:30:31 [WARNUNG] **** SERVER IS RUNNING IN OFFLINE/INSECURE MODE!
14:30:31 [WARNUNG] The server will make no attempt to authenticate usernames. Be
ware.
14:30:31 [WARNUNG] While this makes the game possible to play without internet a
ccess, it also opens up the ability for hackers to connect with any username the
y choose.
14:30:31 [WARNUNG] To change this, set "online-mode" to "true" in the server.set
tings file.
14:30:31 [INFO] This server is running Craftbukkit version git-Bukkit-0.0.0-823-
gb9d0b04-b860jnks (MC: 1.6.6)
14:30:31 [INFO] Preparing level "world"
14:30:32 [INFO] Preparing start region for level 0
14:30:33 [INFO] Preparing spawn area: 36%
14:30:33 [INFO] Preparing start region for level 1
14:30:34 [INFO] Preparing spawn area: 48%
14:30:34 [INFO] Done (0,286s)! For help, type "help" or "?"
14:30:54 [INFO] Killablick [/5.22.122.152:49698] logged in with entity id 37 at
([ world] 130.78125, 71.0, 52.6875)
14:31:48 [WARNUNG] Can't keep up! Did the system time change, or is the server o
verloaded?
14:32:32 [WARNUNG] Can't keep up! Did the system time change, or is the server o
verloaded?
14:38:47 [WARNUNG] Can't keep up! Did the system time change, or is the server o
verloaded?
14:45:02 [INFO] yannick_thiel [/5.94.62.107:1645] logged in with entity id 588 a
t ([ world] 160.6875, 85.0, 31.28125)
14:46:14 [SCHWERWIEGEND] java.net.SocketException: Software caused connection ab
ort: socket write error
14:46:14 [INFO] Connection reset
14:46:14 [SCHWERWIEGEND]        at java.net.SocketOutputStream.socketWrite0(Nati
ve Method)
14:46:14 [SCHWERWIEGEND]        at java.net.SocketOutputStream.socketWrite(Unkno
wn Source)
14:46:14 [SCHWERWIEGEND]        at java.net.SocketOutputStream.write(Unknown Sou
rce)
14:46:14 [SCHWERWIEGEND]        at java.io.BufferedOutputStream.flushBuffer(Unkn
own Source)
14:46:14 [SCHWERWIEGEND]        at java.io.BufferedOutputStream.flush(Unknown So
urce)
14:46:14 [SCHWERWIEGEND]        at java.io.DataOutputStream.flush(Unknown Source
)
14:46:14 [SCHWERWIEGEND]        at net.minecraft.server.NetworkWriterThread.run(
SourceFile:116)
14:46:14 [INFO] yannick_thiel lost connection: disconnect.genericReason
14:46:14 [SCHWERWIEGEND] java.net.SocketException: Software caused connection ab
ort: socket write error
14:46:14 [SCHWERWIEGEND]        at java.net.SocketOutputStream.socketWrite0(Nati
ve Method)
14:46:14 [SCHWERWIEGEND]        at java.net.SocketOutputStream.socketWrite(Unkno
wn Source)
14:46:14 [SCHWERWIEGEND]        at java.net.SocketOutputStream.write(Unknown Sou
rce)
14:46:14 [SCHWERWIEGEND]        at java.io.BufferedOutputStream.flushBuffer(Unkn
own Source)
14:46:14 [SCHWERWIEGEND]        at java.io.BufferedOutputStream.flush(Unknown So
urce)
14:46:14 [SCHWERWIEGEND]        at java.io.DataOutputStream.flush(Unknown Source
)
14:46:14 [SCHWERWIEGEND]        at net.minecraft.server.NetworkWriterThread.run(
SourceFile:116)
14:47:17 [INFO] yannick_thiel [/5.94.62.107:1657] logged in with entity id 665 a
t ([ world] 156.84375, 83.0, 39.28125)
14:48:33 [WARNUNG] Can't keep up! Did the system time change, or is the server o
verloaded?
14:48:35 [INFO] Connection reset
14:48:35 [INFO] yannick_thiel lost connection: disconnect.endOfStream
14:54:56 [WARNUNG] Can't keep up! Did the system time change, or is the server o
verloaded?
15:16:33 [WARNUNG] Can't keep up! Did the system time change, or is the server o
verloaded?
15:21:03 [WARNUNG] Can't keep up! Did the system time change, or is the server o
verloaded?
15:46:11 [INFO] Connection reset
15:46:11 [SCHWERWIEGEND] java.net.SocketException: Software caused connection ab
ort: socket write error
15:46:11 [SCHWERWIEGEND]        at java.net.SocketOutputStream.socketWrite0(Nati
ve Method)
15:46:11 [SCHWERWIEGEND]        at java.net.SocketOutputStream.socketWrite(Unkno
wn Source)
15:46:11 [SCHWERWIEGEND]        at java.net.SocketOutputStream.write(Unknown Sou
rce)
15:46:11 [SCHWERWIEGEND]        at java.io.BufferedOutputStream.flushBuffer(Unkn
own Source)
15:46:11 [SCHWERWIEGEND]        at java.io.BufferedOutputStream.flush(Unknown So
urce)
15:46:11 [SCHWERWIEGEND]        at java.io.DataOutputStream.flush(Unknown Source
)
15:46:11 [SCHWERWIEGEND]        at net.minecraft.server.NetworkWriterThread.run(
SourceFile:116)
15:46:11 [SCHWERWIEGEND] java.net.SocketException: Software caused connection ab
ort: socket write error
15:46:11 [SCHWERWIEGEND]        at java.net.SocketOutputStream.socketWrite0(Nati
ve Method)
15:46:11 [SCHWERWIEGEND]        at java.net.SocketOutputStream.socketWrite(Unkno
wn Source)
15:46:11 [SCHWERWIEGEND]        at java.net.SocketOutputStream.write(Unknown Sou
rce)
15:46:11 [SCHWERWIEGEND]        at java.io.BufferedOutputStream.flushBuffer(Unkn
own Source)
15:46:11 [SCHWERWIEGEND]        at java.io.BufferedOutputStream.flush(Unknown So
urce)
15:46:11 [SCHWERWIEGEND]        at java.io.DataOutputStream.flush(Unknown Source
)
15:46:11 [SCHWERWIEGEND]        at net.minecraft.server.NetworkWriterThread.run(
SourceFile:116)
15:46:11 [INFO] Killablick lost connection: disconnect.endOfStream
15:58:57 [INFO] Killablick [/5.22.122.152:51307] logged in with entity id 2421 a
t ([ world] 218.09375, 78.0, 30.8125)
16:00:55 [INFO] Killablick lost connection: disconnect.quitting
16:00:55 [INFO] Connection reset
16:01:08 [INFO] Killablick [/5.22.122.152:51329] logged in with entity id 2483 a
t ([ world] 190.18077460432363, 82.0, 37.54273331517028)
16:01:55 [INFO] Connection reset
16:01:55 [SCHWERWIEGEND] java.net.SocketException: Connection reset by peer: soc
ket write error
16:01:55 [SCHWERWIEGEND]        at java.net.SocketOutputStream.socketWrite0(Nati
ve Method)
16:01:55 [SCHWERWIEGEND]        at java.net.SocketOutputStream.socketWrite(Unkno
wn Source)
16:01:55 [SCHWERWIEGEND]        at java.net.SocketOutputStream.write(Unknown Sou
rce)
16:01:55 [SCHWERWIEGEND]        at java.io.BufferedOutputStream.write(Unknown So
urce)
16:01:55 [SCHWERWIEGEND]        at java.io.DataOutputStream.write(Unknown Source
)
16:01:55 [SCHWERWIEGEND]        at net.minecraft.server.Packet51MapChunk.a(Packe
t51MapChunk.java:85)
16:01:55 [SCHWERWIEGEND]        at net.minecraft.server.Packet.a(Packet.java:121
)
16:01:55 [SCHWERWIEGEND]        at net.minecraft.server.NetworkManager.f(Network
Manager.java:122)
16:01:55 [SCHWERWIEGEND]        at net.minecraft.server.NetworkManager.d(Network
Manager.java:263)
16:01:55 [SCHWERWIEGEND]        at net.minecraft.server.NetworkWriterThread.run(
SourceFile:107)
16:01:55 [INFO] Killablick lost connection: disconnect.endOfStream
16:14:41 [INFO] Killablick [/5.22.122.152:52504] logged in with entity id 2498 a
t ([ world] 191.40625, 82.0, 32.90625)
16:18:02 [SCHWERWIEGEND] java.net.SocketException: Software caused connection ab
ort: socket write error
16:18:02 [INFO] Connection reset
16:18:02 [SCHWERWIEGEND]        at java.net.SocketOutputStream.socketWrite0(Nati
ve Method)
16:18:02 [SCHWERWIEGEND]        at java.net.SocketOutputStream.socketWrite(Unkno
wn Source)
16:18:02 [SCHWERWIEGEND]        at java.net.SocketOutputStream.write(Unknown Sou
rce)
16:18:02 [SCHWERWIEGEND]        at java.io.BufferedOutputStream.flushBuffer(Unkn
own Source)
16:18:02 [SCHWERWIEGEND]        at java.io.BufferedOutputStream.write(Unknown So
urce)
16:18:02 [SCHWERWIEGEND]        at java.io.DataOutputStream.write(Unknown Source
)
16:18:02 [SCHWERWIEGEND]        at net.minecraft.server.Packet51MapChunk.a(Packe
t51MapChunk.java:85)
16:18:02 [SCHWERWIEGEND]        at net.minecraft.server.Packet.a(Packet.java:121
)
16:18:02 [SCHWERWIEGEND]        at net.minecraft.server.NetworkManager.f(Network
Manager.java:122)
16:18:02 [SCHWERWIEGEND]        at net.minecraft.server.NetworkManager.d(Network
Manager.java:263)
16:18:02 [SCHWERWIEGEND]        at net.minecraft.server.NetworkWriterThread.run(
SourceFile:107)
16:18:02 [INFO] Killablick lost connection: disconnect.endOfStream
16:18:09 [INFO] Killablick [/5.22.122.152:52556] logged in with entity id 2557 a
t ([ world] 191.14789873784963, 82.0, 28.50586702170421)
16:20:01 [INFO] <Killablick> hhh
16:36:40 [INFO] Connection reset
16:36:40 [SCHWERWIEGEND] java.net.SocketException: Software caused connection ab
ort: socket write error
16:36:40 [SCHWERWIEGEND]        at java.net.SocketOutputStream.socketWrite0(Nati
ve Method)
16:36:40 [SCHWERWIEGEND]        at java.net.SocketOutputStream.socketWrite(Unkno
wn Source)
16:36:40 [SCHWERWIEGEND]        at java.net.SocketOutputStream.write(Unknown Sou
rce)
16:36:40 [SCHWERWIEGEND]        at java.io.BufferedOutputStream.flushBuffer(Unkn
own Source)
16:36:40 [SCHWERWIEGEND]        at java.io.BufferedOutputStream.flush(Unknown So
urce)
16:36:40 [SCHWERWIEGEND]        at java.io.DataOutputStream.flush(Unknown Source
)
16:36:40 [SCHWERWIEGEND]        at net.minecraft.server.NetworkWriterThread.run(
SourceFile:116)
16:36:40 [SCHWERWIEGEND] java.net.SocketException: Software caused connection ab
ort: socket write error
16:36:40 [SCHWERWIEGEND]        at java.net.SocketOutputStream.socketWrite0(Nati
ve Method)
16:36:40 [SCHWERWIEGEND]        at java.net.SocketOutputStream.socketWrite(Unkno
wn Source)
16:36:40 [SCHWERWIEGEND]        at java.net.SocketOutputStream.write(Unknown Sou
rce)
16:36:40 [SCHWERWIEGEND]        at java.io.BufferedOutputStream.flushBuffer(Unkn
own Source)
16:36:40 [SCHWERWIEGEND]        at java.io.BufferedOutputStream.flush(Unknown So
urce)
16:36:40 [INFO] Killablick lost connection: disconnect.endOfStream
16:36:40 [SCHWERWIEGEND]        at java.io.DataOutputStream.flush(Unknown Source
)
16:36:40 [SCHWERWIEGEND]        at net.minecraft.server.NetworkWriterThread.run(
SourceFile:116)
16:36:46 [INFO] Killablick [/5.22.122.152:52661] logged in with entity id 3150 a
t ([ world] 240.28125, 70.0, 22.3125)
17:09:53 [WARNUNG] Can't keep up! Did the system time change, or is the server o
verloaded?
17:10:05 [INFO] Killablick lost connection: disconnect.quitting
17:10:05 [INFO] Connection reset
17:15:46 [WARNUNG] Can't keep up! Did the system time change, or is the server o
verloaded?