curl backup fails sometimes with unexpected eof while reading

[slu]

Hi,

we use the curl [1] backup method since years without issue, but actual with Debian 13 and pfSense 2.8.1 we got sometimes this error during download the backup:

curl: (56) OpenSSL SSL_read: OpenSSL/3.5.1: error:0A000126:SSL routines::unexpected eof while reading, errno 0

Error in the pfSense logs:

2025/09/16 14:51:42 [crit] XX#XX: *XX SSL_write() failed (13: Permission denied) while processing HTTP/2 connection, client: 192.168.14.23, server: 0.0.0.0:443

The backup abort in this moment and is not complete, here are the options:

curl -L -k --cookie cookies.txt --cookie-jar cookies.txt \
     --data-urlencode "download=download" \
     --data-urlencode "backupdata=yes" \
     --data-urlencode "backupssh=yes" \
     --data-urlencode "__csrf_magic=$(head -n 1 csrf.txt)" \
[...]

We try now to disable the RRD files, maybe this help.

Any idea whats wrong here?

curl 8.14.1
OpenSSL 3.5.1 1 Jul 2025

[1] https://docs.netgate.com/pfsense/en/latest/backup/remote-backup.html#using-curl