tcp settings

I'm wondering if there's a disconnect between my servers postgresql.conf and the system tcp settings? Are the config names supposed to match a file in /proc/sys/net/ipv4?


In postgres 14 install's postgresql.conf on centos 7:

# - TCP settings -
# see "man tcp" for details

#tcp_keepalives_idle = 0                # TCP_KEEPIDLE, in seconds;
                                        # 0 selects the system default
#tcp_keepalives_interval = 0            # TCP_KEEPINTVL, in seconds;
                                        # 0 selects the system default
#tcp_keepalives_count = 0               # TCP_KEEPCNT;
                                        # 0 selects the system default
#tcp_user_timeout = 0                   # TCP_USER_TIMEOUT, in milliseconds;
                                        # 0 selects the system default

#client_connection_check_interval = 0   # time between checks for client
                                        # disconnection while running queries;
                                        # 0 for never

and in the /proc/sys/net/ipv4 I see no "keepalives" plural.

tcp_abort_on_overflow             tcp_fastopen_key           tcp_min_snd_mss           tcp_slow_start_after_idle    
tcp_adv_win_scale                 tcp_fin_timeout            tcp_min_tso_segs          tcp_stdurg                   
tcp_allowed_congestion_control    tcp_frto                   tcp_moderate_rcvbuf       tcp_synack_retries                 
tcp_app_win                       tcp_invalid_ratelimit      tcp_mtu_probing           tcp_syncookies                     
tcp_autocorking                   tcp_keepalive_intvl(75)    tcp_no_metrics_save       tcp_syn_retries                    
tcp_available_congestion_control  tcp_keepalive_probes(9)    tcp_notsent_lowat         tcp_thin_dupack                    
tcp_base_mss                      tcp_keepalive_time(7200)   tcp_orphan_retries        tcp_thin_linear_timeouts           
tcp_challenge_ack_limit           tcp_limit_output_bytes     tcp_reordering            tcp_timestamps                     
tcp_congestion_control            tcp_low_latency            tcp_retrans_collapse      tcp_tso_win_divisor           
tcp_dsack                         tcp_max_orphans            tcp_retries1              tcp_tw_recycle                      
tcp_early_retrans                 tcp_max_ssthresh           tcp_retries2              tcp_tw_reuse                  
tcp_ecn                           tcp_max_syn_backlog        tcp_rfc1337               tcp_window_scaling            
tcp_fack                          tcp_max_tw_buckets         tcp_rmem                  tcp_wmem              
tcp_fastopen                      tcp_mem                    tcp_sack                  tcp_workaround_signed_windows

My issue is that psql is timing out with "SSL SYSCALL error: Connection timed out".  The TCP defaults for keepalive look fine to me but not what I'm experiencing.  I have PGCONNECT_TIMEOUT=0 in my env for psql.