From 46928269bbdf7c113b517a8fe2c65c7be4d01aee Mon Sep 17 00:00:00 2001
From: andryyy <andre.peters@debinux.de>
Date: Thu, 31 Dec 2020 23:26:03 +0100
Subject: [PATCH] [Backup Helper] Possible workaround for #3913

---
 helper-scripts/backup_and_restore.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/helper-scripts/backup_and_restore.sh b/helper-scripts/backup_and_restore.sh
index 45098cc9..82002d7b 100755
--- a/helper-scripts/backup_and_restore.sh
+++ b/helper-scripts/backup_and_restore.sh
@@ -126,6 +126,7 @@ function backup() {
           --network $(docker network ls -qf name=${CMPS_PRJ}_mailcow-network) \
           -v $(docker volume ls -qf name=${CMPS_PRJ}_mysql-vol-1):/var/lib/mysql/:ro,z \
           --entrypoint= \
+          --sysctl net.ipv6.conf.all.disable_ipv6=1 \
           -v ${BACKUP_LOCATION}/mailcow-${DATE}:/backup:z \
           ${SQLIMAGE} /bin/sh -c "mariabackup --host mysql --user root --password ${DBROOT} --backup --rsync --target-dir=/backup_mariadb ; \
           mariabackup --prepare --target-dir=/backup_mariadb ; \