# Socket problems after DC 10.11 to 10.50 upgrade

**URL:** <https://forums.digi.com/t/socket-problems-after-dc-10-11-to-10-50-upgrade/10307>\
**Category:** Rabbit\
**Created:** [May 26, 2009, 1:43pm UTC](https://forums.digi.com/t/socket-problems-after-dc-10-11-to-10-50-upgrade/10307 "2009-05-26T13:43:08Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![tomwp](https://avatars.discourse-cdn.com/v4/letter/t/50afbb/32.png) [@tomwp](https://forums.digi.com/u/tomwp)\
**Post date:** [May 26, 2009, 1:43pm UTC](https://forums.digi.com/t/socket-problems-after-dc-10-11-to-10-50-upgrade/10307/1 "2009-05-26T13:43:08Z")

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Hi,

I had a working application built using DC 10.11, with it I was experiencing occasional ethernet problems (drops connection once per hour). After seeing the list of bug fixes from DC 10.11 to 10.50 includes some TCP fixes, I have been trying to get my code running with the new compiler/libraries. I have added my custom board definitions and have the code running but the TCP sockets are no longer open. The stack is running fine as I can ping the unit and get a response, however when I try to connect to a port that should be open I get a RST flag back from the unit. Is there some other change that has been made between the versions that I need to accomodate.

Setup details:  
Custom board using a 4000 processor with inbuilt ethernet.  
Passive open port 1495 for communications.  
Port 80 open as a webserver.  
Unit is under constant control from a PC.

The original problem I was having was that about 1 per hour the unit would send a reset flag in response to a command. I couldn’t trace the source of this so tried upgrading DC version.

Any ideas what the original problem was or the upgrade problem is would be greatfully received.

Thanks,

Tom.

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<div class="post-metadata">

**Author:** ![tomwp](https://avatars.discourse-cdn.com/v4/letter/t/50afbb/32.png) [@tomwp](https://forums.digi.com/u/tomwp)\
**Post date:** [May 26, 2009, 3:37pm UTC](https://forums.digi.com/t/socket-problems-after-dc-10-11-to-10-50-upgrade/10307/2 "2009-05-26T15:37:06Z")

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I have also checked that both sock\_init() and tcp\_listen() are called and return with no errors. sock\_error() returns 0 as well.

Also the Link LED is on and the Activity LED (on PCB) flash when trying to connect.

I am assuming it is a problem in the configuration of the board but I have no idea where to start. Any help greatly appreciated.

Tom.