# WP7607-1 with Legato 21.05, tcp-server not working as expected

**URL:** <https://forum.legato.io/t/wp7607-1-with-legato-21-05-tcp-server-not-working-as-expected/6881>\
**Category:** Uncategorized\
**Created:** [January 22, 2025, 10:50am UTC](https://forum.legato.io/t/wp7607-1-with-legato-21-05-tcp-server-not-working-as-expected/6881 "2025-01-22T10:50:39Z")\
**Posts on this page:** 1\
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**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\
**Post date:** [January 22, 2025, 11:03am UTC](https://forum.legato.io/t/wp7607-1-with-legato-21-05-tcp-server-not-working-as-expected/6881/4 "2025-01-22T11:03:17Z")

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Did you capture wireshark log for investigation?

Does this application help?

> [@Networking: TCP server Operation not permitted (errno -1)](https://forum.legato.io/t/networking-tcp-server-operation-not-permitted-errno-1/4650/4):
>
> You can use my TCP echo server application which uses read() instead of recv(). Procedure: compile and download attached application iptables -I INPUT -j ACCEPT app start fwupdateDownloader in Linux PC, type “nc 192.168.2.2 5000” after connected, you can type some characters and the application will echo back to linux PC. [fwupdateDownloader.rar](https://forum.legato.io/uploads/short-url/rtNMsZzuYC3CC0QmrsWh0EfadIR.rar) (174.0 KB)

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