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I have been running a Geth node on Ropsten for the past couple of months and it has been running fine; all my transactions go through and it hasn't been too heavy on the system resources either. I use the following command to start the node:

geth --datadir "C:/ropsten-test-net-project/Data/Node" --testnet --rpc --rpcport "8545" --rpcaddr "0.0.0.0" --rpccorsdomain "*" --rpcapi="personal, eth, network, web3, net" --ipcpath "C:/ropsten-test-net-project/Data/Node/geth.ipc" --syncmode "fast" console 2>>"E:/Etherium + Solidity/test-net-project/Logs/myLog1.txt" --cache 2048

For testing purposes, I have enabled port forwarding on my router and added inbound and outbound rules in windows firewall to allow other systems in my network to connect to this node.

The last few days, Geth started getting heavy on the resources, maxing out the CPU, SSD writes and almost maxing out 16 GB of RAM. At first i thought it is just processing new blocks but after a few Geth crashes and out of memory errors, i decided to look at the Geth logs and found the following lines repeated numerous times:

Screenshot of Geth logs I was not conducting any transactions and my smart contract and server were not running when these logs were generated. To ensure this wasn't an attack, i enabled logging in windows firewall. Upon observing the firewall logs, i did not see any repeating IP addresses that would indicate requests coming from an attacker.

I would like to know if anyone else has experienced this (or similar) issue and how it can be resolved.

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