Hi Praveen, 

You’d probably have to check the exact reason why epoll_ctl fails. But some 
quick comments:
- we’re moving away from binary api in vcl. We’re still building it but it’s 
slowly being deprecated. I’d recommend switching to sapi api.
- maybe check vl_api_app_attach_reply_t_handler and confirm that 
wrk->app_event_queue fd we got from vl_socket_client_recv_fd_msg2 is 
reasonable. 

Regards, 
Florin

> On Nov 18, 2025, at 7:59 PM, Praveen Singh via lists.fd.io 
> <[email protected]> wrote:
> 
> Hi All,
> When i connected my vcl app, i got below error. any input on below error?
> <inline.0.part>
> 
> 
> 

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