The error "kex_exchange_identification: read: Connection reset by peer" generally indicates that the connection was not able to establish successfully. This can be caused by several factors:
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Network Issues: Check if your network connection is stable and if there are no interruptions or fluctuations. Try to ping the host IP address to ensure connectivity.
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Firewall Issues: There might be firewall rules in place that are blocking the connection. Check if the connection port is added to the allowed list of the firewall.
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SSH Server Configurations: Make sure that the SSH server configurations are correct, such as the listening port, user login details, etc.
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SSH Client Configurations: Ensure that your SSH client configurations are correct and up to date, and try to authenticate again.
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Permission and Ownership Issues: Check if the ownership and permissions of the SSH files are correct.
In short, there can be various reasons for this error, and troubleshooting the issue can involve checking the network connectivity, firewall rules, SSH server and client configurations, file permissions and ownership, and more.