# TCP

[Open dashboard](https://my.tuna.am/monitors)

The TCP monitor checks the availability of services over a TCP connection: databases, mail servers, game servers and other TCP applications.

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## How it works

1. The system establishes a TCP connection to the specified host and port
2. If the connection succeeds — the service is considered available
3. On a connection error — a notification is sent

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## Parameters

### Description

| Parameter       | Description                   | Required |
| --------------- | ----------------------------- | -------- |
| **Name**        | Unique monitor name           | Yes      |
| **Description** | A note about the task purpose | No       |

![screenshot with monitor description](/docs/img/monitors/description.png)

### Details

| Parameter    | Description                  | Default    |
| ------------ | ---------------------------- | ---------- |
| **Resource** | `host:port`                  | -          |
| **Timeout**  | Maximum connection wait time | 10 seconds |
| **Retries**  | Number of retries on error   | 3          |

![screenshot with details of the TCP monitor](/docs/img/monitors/details_tcp.png)

### Regions

Choose one or more regions for the check. The monitor will send requests from each selected region at the specified interval.

| Parameter    | Description     | Default   |
| ------------ | --------------- | --------- |
| **Interval** | Check frequency | 5 minutes |

![screenshot with monitor region](/docs/img/monitors/region.png)

### Notifications

Here you can specify contact groups for notifications. If left unspecified, the user's email is used.

You can also set a waiting period — **Grace Period**. It is added to the expected time of the next signal. For example, if the interval is 5 minutes and the Grace Period is 2 minutes, the alert will be sent 7 minutes after the last signal. Repeated notifications remind you of the problem; you can set the interval and number of these reminders.

![screenshot with monitor job details](/docs/img/monitors/notify.png)

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