http: TLS handshake error from <ip:port>: remote error: tls: bad certificate

[fisherwei]

version: namespace-node-affinity-2.1.1
k8s version: v1.18.x

After 1 year of running, pod output an error:

2025/04/17 13:16:30 http: TLS handshake error from 192.168.4.3:54870: remote error: tls: bad certificate
2025/04/17 13:16:30 http: TLS handshake error from 192.168.4.3:54888: remote error: tls: bad certificate
2025/04/17 13:16:41 http: TLS handshake error from 192.168.4.3:57936: remote error: tls: bad certificate
2025/04/17 13:16:41 http: TLS handshake error from 192.168.4.3:57946: remote error: tls: bad certificate
2025/04/17 13:16:52 http: TLS handshake error from 192.168.4.3:60838: remote error: tls: bad certificate
2025/04/17 13:16:52 http: TLS handshake error from 192.168.4.3:60856: remote error: tls: bad certificate
2025/04/17 13:21:09 http: TLS handshake error from 192.168.4.3:41180: remote error: tls: bad certificate

Expected:
no error