v.20.4Improvement

Avoid Logging Error for RST Packets on Connect in IPVS Balancer

Avoid printing error message in log if client sends RST packet immediately on connect. It is typical behaviour of IPVS balancer with keepalived and VRRP. This fixes #1851 #10274 (alexey-milovidov)
Avoids logging error messages when a client immediately sends a TCP RST packet upon connection, which is common with IPVS balancers using keepalived and VRRP.

Why it matters

This feature prevents unnecessary error logs caused by normal behavior of IPVS load balancers that close connections immediately with a reset packet on connect. It reduces log noise and helps operators focus on real issues instead of expected connection resets.

How to use it

The fix is applied internally in the ClickHouse server and requires no user action or configuration changes. Users will automatically benefit from cleaner logs after upgrading to the version containing this fix.