Can’t find the cause of "SQLSTATE[HY000]: General error: 7 SSL SYSCALL error: EOF detected"

I originally posted this on Posting here because my problem seems to be related to HAProxy instead of CockroachDB.

I keep getting the following error message on my website when connecting to my CockroachDB cluster through HAProxy:

SQLSTATE[HY000]: General error: 7 SSL SYSCALL error: EOF detected

The error occurs randomly. Sometimes I can run 10 queries before the message reappears, other times it appears for every query. Usually I can re-run the query a second after the message appears and the query succeeds.

If I connect directly to any of the database servers, the error never appears.

So far I haven’t found anything in the log files for haproxy or CockroachDB.

My connection string which uses PHP’s PDO extension:

try {
     // Connect to the server and the database
     $this->link = new PDO(‘pgsql:host=’.$this->serverName.’;port=26257;dbname=’.$usedb.’;sslmode=require;sslrootcert=’.$rootcert.’;sslkey=’.$userkey.’;sslcert=’.$usercert, $this->userName, null, $options);

} catch (PDOException $e) {
     echo ‘Caught PDOExcetion<br>’;
     echo 'Error Message: '.$e->getMessage();
     echo '<br>Error Code: '.$e->getCode();


Haproxy is supposed to be passing through the SSL connections.

My /etc/haproxy/haproxy.cfg:

     log /dev/log local0
     log /dev/log local1 notice
     chroot /var/lib/haproxy
     stats socket /run/haproxy/admin.sock mode 660 level admin expose-fd listeners
     stats timeout 30s
     user haproxy
     group haproxy
     maxconn 4096

     cpu-map 1 0
     cpu-map 2 1

     log global
     mode tcp
     option dontlognull
     option tcplog

     timeout connect 10s
     timeout client 1m
     timeout server 1m

     # TCP keep-alive on client side. Server already enables them.
     option clitcpka

     errorfile 400 /etc/haproxy/errors/400.http
     errorfile 403 /etc/haproxy/errors/403.http
     errorfile 408 /etc/haproxy/errors/408.http
     errorfile 500 /etc/haproxy/errors/500.http
     errorfile 502 /etc/haproxy/errors/502.http
     errorfile 503 /etc/haproxy/errors/503.http
     errorfile 504 /etc/haproxy/errors/504.http

listen psql
     bind :26257
     mode tcp
     balance static-rr
     option httpchk GET /health?ready=1
     server cockroach1 check port 8080
     server cockroach2 check port 8080
     server cockroach3 check port 8080

CockroachDB version: 21.1.8
HAProxy version: 2.4.7 (installed from source)

Where should I be looking for the cause of the error?

Problem solved!

HAProxy does not seem to like PDO::ATTR_PERSISTENT being set to (boolean)True.

I changed it to (boolean)False and the error went away.