How To Install ODK Central on Ubuntu 20.04

1

Let's Encrypt

You have created the domain (odk-central.example.com) and sub-domain (www.odk-central.example.com) names on your cloud provider. If the www sub-domain is not created, Let’s Encrypt fails with Challenge failed for domain odk-central.example.com when validating requests for SSL certificates for your domain.

#Identity And Access Management #Two Factor Authentication #Security & Privacy 311 social mentions

2

DNS Propagation Check

Changes you make to the A-records could take several hours to propagate. There are online tools that may assist in checking the reachability of your domains and sub-domains. Some of these tools are: DNSPropagation, DNS Google, DNS Tester](https://www.dnstester.net/) among others can help in checking on the propagation process.

#Network & Admin #DNS Tools #DNS Propagation Checker 1 social mentions