hi!
I think the better of the way in order to check if the redis database is storing the value of configuration that is breaking your systems is to install rdbtools
https://github.com/sripathikrishnan/redis-rdb-tools.
This way you can use this tool this way:
sudo cp /var/lib/zentyal/dump.rdb .
rdb --command json dump.rdb > redis.json
The redis.json file looks this way:
[{
"services/conf/ServiceTable/keys/srv11/configuration/keys/srvccnf16":"{\"destination_single_port\":\"139\",\"protocol\":\"tcp\",\"readOnly\":1,\"source_range_type\":\"any\",\"destination_range_type\":\"single\"}",
"network/ro/DNSResolver/keys/dnsr2":"{\"nameserver\":\"80.58.61.254\",\"interface\":\"eth0.dhclient\"}",
"services/ro/ServiceTable/keys/srv11/configuration/keys/srvccnf22":"{\"source_range_type\":\"any\",\"protocol\":\"tcp\",\"destination_single_port\":\"3268\",\"readOnly\":1,\"destination_range_type\":\"single\"}",
"ntp/conf/_serviceModuleStatus":"1",
"logs/state":"{\"_temporary_stopped\":0,\"_serviceInstalled\":1,\"_needsSaveAfterConfig\":0}",
"dns/ro/DomainTable/keys/dmn1/txt/keys/t1":"{\"txt_data\":\"lab4.lan\",\"readOnly\":1,\"custom\":\"_kerberos\",\"hostName_selected\":\"custom\"}",
"services/conf/ServiceTable/keys/srv11/configuration/keys/srvccnf23":"{\"destination_single_port\":\"3269\",\"source_range_type\":\"any\",\"destination_range_type\":\"single\",\"protocol\":\"tcp\",\"readOnly\":1}",
"dns/conf/DomainTable/order":"[\"dmn1\"]",
"services/conf/ServiceTable/keys/srv1/configuration/keys/srvccnf1":"{\"protocol\":\"any\",\"source_range_type\":\"any\",\"readOnly\":1,\"destination_range_type\":\"any\"}",
"services/ro/ServiceTable/keys/srv9/configuration/order":"[\"srvccnf9\"]",
"services/conf/ServiceTable/keys/srv11/configuration/keys/srvccnf20":"{\"destination_range_type\":\"single\",\"source_range_type\":\"any\",\"readOnly\":1,\"protocol\":\"tcp\",\"destination_single_port\":\"636\"}",
"firewall/ro/ExternalToEBoxRuleTable/order":"[\"extrnlt2\",\"extrnlt1\"]",
"ntp/ro/Servers/keys/sr1":"{\"server\":\"0.pool.ntp.org\"}",
"network/conf/DNSResolver/order":"[\"dnsr1\",\"dnsr2\"]",
"dns/ro/DomainIpTable/max_id":"2",
"network/conf/GatewayTable/max_id":"1",
(...)
You could share a link to your redis json file if you need some help in order to search the needed key.
I look forwards hearing for you.
Cheers!