# Socket connection timeout (but ACK received?)

**URL:** <https://forum.legato.io/t/socket-connection-timeout-but-ack-received/3482>\
**Category:** Uncategorized\
**Created:** [July 27, 2018, 1:08pm UTC](https://forum.legato.io/t/socket-connection-timeout-but-ack-received/3482 "2018-07-27T13:08:55Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![davidc](https://avatars.discourse-cdn.com/v4/letter/d/a183cd/32.png) [@davidc](https://forum.legato.io/u/davidc)\
**Post date:** [July 30, 2018, 5:08am UTC](https://forum.legato.io/t/socket-connection-timeout-but-ack-received/3482/2 "2018-07-30T05:08:30Z")

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Hi @karlkuhn,

Have you opened the port in firewall (`iptables`) on the FX30?

The firewall for all interfaces other than USB/ECM is by default extremely restrictive - off the top of my head only DNS(udp:53) and ping(icmp) are opened by default - the last rule in the input chain is DROP ALL.

Oh … I’ve also started using `getaddrinfo()` instead of `getnameinfo()` - apparently getnameinfo() has been deprecated and doesn’t play well with IPv6…

ciao, Dave

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