# Outbound IP firewalling of the Go SDK TTN client to the Data API

**URL:** <https://www.thethingsnetwork.org/forum/t/outbound-ip-firewalling-of-the-go-sdk-ttn-client-to-the-data-api/16217>\
**Category:** TTN Network and Services\
**Created:** [July 24, 2018, 11:28am UTC](https://www.thethingsnetwork.org/forum/t/outbound-ip-firewalling-of-the-go-sdk-ttn-client-to-the-data-api/16217 "2018-07-24T11:28:16Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![xor-gate](https://www.thethingsnetwork.org/forum/letter_avatar_proxy/v4/letter/x/b19c9b/32.png) [@xor-gate](https://www.thethingsnetwork.org/forum/u/xor-gate)\
**Post date:** [July 26, 2018, 7:35am UTC](https://www.thethingsnetwork.org/forum/t/outbound-ip-firewalling-of-the-go-sdk-ttn-client-to-the-data-api/16217/4 "2018-07-26T07:35:14Z")

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There are a few ports used, the connected 1904 is not even in the list below:

> [@UDP ports and firewalling](https://www.thethingsnetwork.org/forum/t/udp-ports-and-firewalling/4995/17):
>
> 1. 1700/udp (legacy/Semtech, incl “connection tracking” in iptables)
> 2. 1883/tcp (Multi protocol packet forwarder)
> 3. 1900/tcp + 1901/tcp (Go forwarder aka the “new packet forwarder”)
> 
> And also ;  
> 1883/tcp or 8883/tcp (MQTT according to [https://www.thethingsnetwork.org/docs/applications/mqtt/api.html](https://www.thethingsnetwork.org/docs/applications/mqtt/api.html)

So what do we need to add to the firewall then when using the Go SDK for the TTN client?

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_[View the full topic](https://www.thethingsnetwork.org/forum/t/outbound-ip-firewalling-of-the-go-sdk-ttn-client-to-the-data-api/16217)._