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Unexpected exception during request

I am using apache cassandra 2.2.4

. I have 4 (four) node clusters with a replication factor of 3 in DC1 and a replication factor of 1 in DC2 where DC1 contains 3 (three) nodes and DC2 contains 1 (one) node. There were a few more nodes in this cluster, but for some reason I deleted them and didn't change the replication script. [Please note that the following IP address is not original]

Datacenter: DC1
===============
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address        Load       Tokens       Owns    Host ID                               Rack
UN  21.12.19.91    4.08 GB    256          ?       a45bb676-1ddd-4b22-933b-58653cea680f  RAC1
UN  21.12.19.92    3.92 GB    256          ?       a7735fca-8671-4a20-a759-4a2681aed37e  RAC1
UN  21.12.19.93    4.47 GB    256          ?       d98f3cad-881a-41c8-89c7-170c63c3d236  RAC1
Datacenter: DC2
===============
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address        Load       Tokens       Owns    Host ID                               Rack
UN  21.12.19.99    3.84 GB    256          ?       ccd9ca97-f97a-4473-9a65-49b12a1b60ba  RAC1
The cluster worked fine, but now I have a problem like INFO

. I tried to analyze this question but couldn't do it. Is there anyone familiar with the following scenario? 
INFO  [SharedPool-Worker-2] 2017-02-26 06:56:48,520 Message.java:605 - Unexpected exception during request; channel = [id: 0x637a702c, /18.12.10.17:60926 :> /21.12.19.91:9042]
java.io.IOException: Error while read(...): Connection reset by peer
    at io.netty.channel.epoll.Native.readAddress(Native Method) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
    at io.netty.channel.epoll.EpollSocketChannel$EpollSocketUnsafe.doReadBytes(EpollSocketChannel.java:675) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
    at io.netty.channel.epoll.EpollSocketChannel$EpollSocketUnsafe.epollInReady(EpollSocketChannel.java:714) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
    at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:326) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
    at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:264) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
    at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_66]
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Please make sure your firewall is not disabling TCP connections that are in use. Tcp to support all nodes should be less than the firewall setting. For more information on TCP settings see https://docs.datastax.com/en/cassandra/2.0/cassandra/troubleshooting/trblshootIdleFirewall.html . This helped me solve the problem.



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