---
title: "Network locks"
sidebar_label: "Network locks"
description: "Causes of network blocking, how to view locks, and how to request unblocking"
sidebar_position: 3
---

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# Network blocks

Traffic from certain ports may be temporarily blocked to protect against malicious network activity. A block is applied if:

* the IP address is sending a large volume of spam emails;
* complaints are received regarding the IP address;
* the IP address is found in DNSBL spam lists — public blacklists for IP addresses and domains;
* the IP address is blocked at the request of  Roskomnadzor.

You can [view these blocks](#view-network-blocking) in the Control Panel. If you have resolved the cause of the block, you can [submit a request for unblocking](#submit-request-to-unblock). Each request is reviewed individually, and we do not guarantee a positive response.

Also, some TCP/UDP ports and access to certain internet resources are blocked by default. For more information, see the [Blocked ports and internet resources](/infrastructure/blocked-ports.mdx).

## View network locks \{#view-network-blocking}

1. In the [Control panel](https://my.selectel.ru/network/blocktools/blocks), on the top menu, click **Products** and select **Network Incidents**.

2. Open the **Network locks** tab. Each block specifies the socket and protocol, the blocking period, and the action taken on traffic that meets the blocking conditions:

   * `discard` — traffic is blocked completely;
   * `redirect` — traffic is redirected to an additional scrubbing system;
   * `rate limit` — traffic bandwidth is limited to the specified value (bytes per second).

3. If the IP address is not displayed in the locks, but traffic is limited:

   3.1. Ensure the port is not blocked by default. We block some ports to protect the Selectel infrastructure. For more information, see the [Blocked ports and internet resources](/infrastructure/blocked-ports.mdx).

   3.2. Ensure that the IP address is not blocked due to a DDoS attack. For more details, see the [Blocked attacks](/network-incidents/blocked-attacks.mdx).

   3.3. Check if the IP address is in any spam lists on the [mxtoolbox](https://mxtoolbox.com/blacklists.aspx) website. If the IP address is present in spam lists, [submit a request for unblocking](#submit-request-to-unblock).

   3.4. If the IP address is not blocked and is not in any spam lists, but traffic is still limited, [create a ticket](https://my.selectel.ru/tickets/create/).

   3.5. Wait for a Selectel engineer to respond with the reasons for the block.

## Submit a request for unblocking \{#submit-request-to-unblock}

Each unblocking request is reviewed individually; we do not guarantee a positive outcome.

1. [Create a ticket](https://my.selectel.ru/tickets/create/). In the ticket, specify:

   * the port that needs to be unblocked;

   * purpose of port usage. If you plan to use the port for mailing, specify the type of mailing, the number of emails in the mailing, a sample email, and whether the recipient can opt out of the mailing;

   * the IP address for which the port needs to be unblocked.

2. Wait for a response in the ticket from a Selectel engineer regarding the steps to take for unblocking.

   If the port was blocked due to the IP address being included in a spam list, we will request its removal. We cannot guarantee the result — spam lists are managed by third-party services, and they decide on removal independently.

3. Resolve the cause of the block and report it in the ticket.

4. Wait for a response in the ticket from a Selectel engineer regarding the decision.

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