Unable to login to webmail.example.com with valid credentials: Login Failed

Symptoms

• Unable to login into the webmail (e.g. Horde or Roundcube) webmail.example.com due to the following error:

  PLESK_WARN: Login Failed

• Password reset did not resolve the issue.

• The example.com subscription was migrated from another server.

• example.com resolves to the new server IP address:

  # dig +short example.com
  203.0.113.2

• webmail.example.com resolves to the IP address of the previous server:

  # dig +short webmail.example.com
  198.51.100.2

• DNS settings were changed in order to be pointed to the new server.

• DNS propagation tool, e.g. whatsmydns.net, shows that webmail.example.com still resolves in several countries to the IP address of the previous server.

Cause

DNS records for webmail.example.com are not fully propagated worldwide yet.

Resolution

Wait up to 48 hours until new records are available on all global DNS servers.

Additional Information

How to access a website when DNS changes are not propagated yet?