Found another reason for difficulties, KEEPALIVE won't help.

diff --git a/rigctl.c b/rigctl.c
index d935d59d4fc80d593cab2fc9237c70b168df3724..6a9d58c0ecd2a0c0115bd69fd18f25bfae8491d5 100644 (file)
--- a/rigctl.c
+++ b/rigctl.c
@@ -586,7 +586,6 @@ static gpointer rigctl_server(gpointer data) {
 
   setsockopt(server_socket, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
   setsockopt(server_socket, SOL_SOCKET, SO_REUSEPORT, &on, sizeof(on));
-  setsockopt(server_socket, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof(on));
 
   // bind to listening port
   memset(&server_address,0,sizeof(server_address));