Some applications need to connect to databases or caches. Use these hostnames from inside your site — they only resolve within your hosting container, so they don't work from your laptop.
| MySQL | `mysql` | 3306 | Username, password, and database from your WHP panel. |
| PostgreSQL | `postgres` | 5432 | Available on most plans; ask support if it's missing. |
| Memcached | `memcache` | 11211 | No auth; isolated per container. |
| Redis | `redis` | 6379 | Single DB per site; password in panel. |
For **email** (IMAP, POP3, SMTP), the mail server hostname is **per-domain** — check the **Dashboard** page in WHP for the exact hostname to use in your email client or app.
**Connecting from your laptop?** Use the panel's **phpMyAdmin** (MySQL) or **Adminer** (PostgreSQL) for ad-hoc queries — direct external connections to these internal services are not exposed for security reasons.
