diff --git a/include/nng/nng.h b/include/nng/nng.h
index 08c2326e9..57e8d847e 100644
--- a/include/nng/nng.h
+++ b/include/nng/nng.h
@@ -895,7 +895,7 @@ NNG_DECL nng_listener nng_pipe_listener(nng_pipe);
 
 // NNG_OPT_SOCKET_FD is a write-only integer property that is used to
 // file descriptors (or FILE HANDLE objects on Windows) to a
-// fdconn:// based listener.  This file descriptor will be taken
+// socket:// based listener.  This file descriptor will be taken
 // over and used as a stream connection.  The protocol is compatible
 // with SP over TCP.  This facility is experimental, and intended to
 // allow use with descriptors created via socketpair() or similar.
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 85d044fa3..9e5a6bec2 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -24,8 +24,8 @@ nng_sources(
         device.h
         dialer.c
         dialer.h
-        fdconn.c
-        fdconn.h
+        sockfd.c
+        sockfd.h
         file.c
         file.h
         idhash.c
diff --git a/src/core/platform.h b/src/core/platform.h
index 7da9c57af..0b5ec6344 100644
--- a/src/core/platform.h
+++ b/src/core/platform.h
@@ -440,10 +440,10 @@ extern int nni_plat_udp_sockname(nni_plat_udp *, nni_sockaddr *);
 // an array of HANDLEs.)  If not supported, this returns NNG_ENOTSUP.
 //
 // This API can only create a pair of open file descriptors, suitable for use
-// with the fdconn transport, each bound to the other.  The transport must be
+// with the socket transport, each bound to the other.  The transport must be
 // a bidirectional reliable byte stream.  This should be suitable for use
 // in APIs to transport file descriptors, or across a fork/exec boundary (so
-// that child processes may use these with fdconn to inherit a socket that is
+// that child processes may use these with socket to inherit a socket that is
 // connected to the parent.)
 extern int nni_socket_pair(int *);
 
diff --git a/src/core/fdconn.c b/src/core/sockfd.c
similarity index 99%
rename from src/core/fdconn.c
rename to src/core/sockfd.c
index e50fd70db..42a41e5e9 100644
--- a/src/core/fdconn.c
+++ b/src/core/sockfd.c
@@ -12,8 +12,8 @@
 
 #include <nng/nng.h>
 
-#include "core/fdconn.h"
 #include "core/nng_impl.h"
+#include "core/sockfd.h"
 
 // We will accept up to this many FDs to be queued up for
 // accept, before we start rejecting with NNG_ENOSPC.  Once
diff --git a/src/core/fdconn.h b/src/core/sockfd.h
similarity index 100%
rename from src/core/fdconn.h
rename to src/core/sockfd.h
diff --git a/src/core/stream.c b/src/core/stream.c
index 0ea184e4f..99002fcdf 100644
--- a/src/core/stream.c
+++ b/src/core/stream.c
@@ -15,7 +15,7 @@
 #include "core/nng_impl.h"
 #include <nng/supplemental/tls/tls.h>
 
-#include "core/fdconn.h"
+#include "core/sockfd.h"
 #include "core/tcp.h"
 #include "supplemental/tls/tls_api.h"
 #include "supplemental/websocket/websocket.h"
diff --git a/src/platform/posix/CMakeLists.txt b/src/platform/posix/CMakeLists.txt
index b9ea443b4..0a88419e9 100644
--- a/src/platform/posix/CMakeLists.txt
+++ b/src/platform/posix/CMakeLists.txt
@@ -76,7 +76,6 @@ if (NNG_PLATFORM_POSIX)
             posix_clock.c
             posix_debug.c
             posix_file.c
-            posix_fdconn.c
             posix_ipcconn.c
             posix_ipcdial.c
             posix_ipclisten.c
@@ -84,6 +83,7 @@ if (NNG_PLATFORM_POSIX)
             posix_resolv_gai.c
             posix_sockaddr.c
             posix_socketpair.c
+            posix_sockfd.c
             posix_tcpconn.c
             posix_tcpdial.c
             posix_tcplisten.c
diff --git a/src/platform/posix/posix_fdconn.c b/src/platform/posix/posix_sockfd.c
similarity index 85%
rename from src/platform/posix/posix_fdconn.c
rename to src/platform/posix/posix_sockfd.c
index 78a6231d9..2642ac205 100644
--- a/src/platform/posix/posix_fdconn.c
+++ b/src/platform/posix/posix_sockfd.c
@@ -17,7 +17,7 @@
 #include <sys/uio.h>
 #include <unistd.h>
 
-#include "core/fdconn.h"
+#include "core/sockfd.h"
 #include "platform/posix/posix_aio.h"
 
 struct nni_sfd_conn {
@@ -31,7 +31,7 @@ struct nni_sfd_conn {
 };
 
 static void
-fdc_dowrite(nni_sfd_conn *c)
+sfd_dowrite(nni_sfd_conn *c)
 {
 	nni_aio *aio;
 	int      fd;
@@ -96,7 +96,7 @@ fdc_dowrite(nni_sfd_conn *c)
 }
 
 static void
-fdc_doread(nni_sfd_conn *c)
+sfd_doread(nni_sfd_conn *c)
 {
 	nni_aio *aio;
 	int      fd;
@@ -161,7 +161,7 @@ fdc_doread(nni_sfd_conn *c)
 }
 
 static void
-fdc_error(void *arg, int err)
+sfd_error(void *arg, int err)
 {
 	nni_sfd_conn *c = arg;
 	nni_aio *     aio;
@@ -179,7 +179,7 @@ fdc_error(void *arg, int err)
 }
 
 static void
-fdc_close(void *arg)
+sfd_close(void *arg)
 {
 	nni_sfd_conn *c = arg;
 	nni_mtx_lock(&c->mtx);
@@ -198,13 +198,13 @@ fdc_close(void *arg)
 	nni_mtx_unlock(&c->mtx);
 }
 
-// fdc_fini may block briefly waiting for the pollq thread.
+// sfd_fini may block briefly waiting for the pollq thread.
 // To get that out of our context, we simply reap this.
 static void
-fdc_fini(void *arg)
+sfd_fini(void *arg)
 {
 	nni_sfd_conn *c = arg;
-	fdc_close(c);
+	sfd_close(c);
 	if (c->pfd != NULL) {
 		nni_posix_pfd_fini(c->pfd);
 	}
@@ -213,32 +213,32 @@ fdc_fini(void *arg)
 	NNI_FREE_STRUCT(c);
 }
 
-static nni_reap_list fdc_reap_list = {
+static nni_reap_list sfd_reap_list = {
 	.rl_offset = offsetof(nni_sfd_conn, reap),
-	.rl_func   = fdc_fini,
+	.rl_func   = sfd_fini,
 };
 static void
-fdc_free(void *arg)
+sfd_free(void *arg)
 {
 	struct nni_sfd_conn *c = arg;
-	nni_reap(&fdc_reap_list, c);
+	nni_reap(&sfd_reap_list, c);
 }
 
 static void
-fdc_cb(nni_posix_pfd *pfd, unsigned events, void *arg)
+sfd_cb(nni_posix_pfd *pfd, unsigned events, void *arg)
 {
 	struct nni_sfd_conn *c = arg;
 
 	if (events & (NNI_POLL_HUP | NNI_POLL_ERR | NNI_POLL_INVAL)) {
-		fdc_error(c, NNG_ECONNSHUT);
+		sfd_error(c, NNG_ECONNSHUT);
 		return;
 	}
 	nni_mtx_lock(&c->mtx);
 	if ((events & NNI_POLL_IN) != 0) {
-		fdc_doread(c);
+		sfd_doread(c);
 	}
 	if ((events & NNI_POLL_OUT) != 0) {
-		fdc_dowrite(c);
+		sfd_dowrite(c);
 	}
 	events = 0;
 	if (!nni_list_empty(&c->writeq)) {
@@ -254,7 +254,7 @@ fdc_cb(nni_posix_pfd *pfd, unsigned events, void *arg)
 }
 
 static void
-fdc_cancel(nni_aio *aio, void *arg, int rv)
+sfd_cancel(nni_aio *aio, void *arg, int rv)
 {
 	nni_sfd_conn *c = arg;
 
@@ -267,7 +267,7 @@ fdc_cancel(nni_aio *aio, void *arg, int rv)
 }
 
 static void
-fdc_send(void *arg, nni_aio *aio)
+sfd_send(void *arg, nni_aio *aio)
 {
 	nni_sfd_conn *c = arg;
 	int           rv;
@@ -277,7 +277,7 @@ fdc_send(void *arg, nni_aio *aio)
 	}
 	nni_mtx_lock(&c->mtx);
 
-	if ((rv = nni_aio_schedule(aio, fdc_cancel, c)) != 0) {
+	if ((rv = nni_aio_schedule(aio, sfd_cancel, c)) != 0) {
 		nni_mtx_unlock(&c->mtx);
 		nni_aio_finish_error(aio, rv);
 		return;
@@ -285,7 +285,7 @@ fdc_send(void *arg, nni_aio *aio)
 	nni_aio_list_append(&c->writeq, aio);
 
 	if (nni_list_first(&c->writeq) == aio) {
-		fdc_dowrite(c);
+		sfd_dowrite(c);
 		// If we are still the first thing on the list, that
 		// means we didn't finish the job, so arm the poller to
 		// complete us.
@@ -297,7 +297,7 @@ fdc_send(void *arg, nni_aio *aio)
 }
 
 static void
-fdc_recv(void *arg, nni_aio *aio)
+sfd_recv(void *arg, nni_aio *aio)
 {
 	nni_sfd_conn *c = arg;
 	int           rv;
@@ -307,7 +307,7 @@ fdc_recv(void *arg, nni_aio *aio)
 	}
 	nni_mtx_lock(&c->mtx);
 
-	if ((rv = nni_aio_schedule(aio, fdc_cancel, c)) != 0) {
+	if ((rv = nni_aio_schedule(aio, sfd_cancel, c)) != 0) {
 		nni_mtx_unlock(&c->mtx);
 		nni_aio_finish_error(aio, rv);
 		return;
@@ -319,7 +319,7 @@ fdc_recv(void *arg, nni_aio *aio)
 	// many cases.  We also need not arm a list if it was already
 	// armed.
 	if (nni_list_first(&c->readq) == aio) {
-		fdc_doread(c);
+		sfd_doread(c);
 		// If we are still the first thing on the list, that
 		// means we didn't finish the job, so arm the poller to
 		// complete us.
@@ -330,24 +330,24 @@ fdc_recv(void *arg, nni_aio *aio)
 	nni_mtx_unlock(&c->mtx);
 }
 
-static const nni_option fdc_options[] = {
+static const nni_option sfd_options[] = {
 	{
 	    .o_name = NULL,
 	},
 };
 
 static int
-fdc_get(void *arg, const char *name, void *buf, size_t *szp, nni_type t)
+sfd_get(void *arg, const char *name, void *buf, size_t *szp, nni_type t)
 {
 	nni_sfd_conn *c = arg;
-	return (nni_getopt(fdc_options, name, c, buf, szp, t));
+	return (nni_getopt(sfd_options, name, c, buf, szp, t));
 }
 
 static int
-fdc_set(void *arg, const char *name, const void *buf, size_t sz, nni_type t)
+sfd_set(void *arg, const char *name, const void *buf, size_t sz, nni_type t)
 {
 	nni_sfd_conn *c = arg;
-	return (nni_setopt(fdc_options, name, c, buf, sz, t));
+	return (nni_setopt(sfd_options, name, c, buf, sz, t));
 }
 
 int
@@ -369,14 +369,14 @@ nni_sfd_conn_alloc(nni_sfd_conn **cp, int fd)
 	nni_aio_list_init(&c->readq);
 	nni_aio_list_init(&c->writeq);
 
-	c->stream.s_free  = fdc_free;
-	c->stream.s_close = fdc_close;
-	c->stream.s_recv  = fdc_recv;
-	c->stream.s_send  = fdc_send;
-	c->stream.s_get   = fdc_get;
-	c->stream.s_set   = fdc_set;
+	c->stream.s_free  = sfd_free;
+	c->stream.s_close = sfd_close;
+	c->stream.s_recv  = sfd_recv;
+	c->stream.s_send  = sfd_send;
+	c->stream.s_get   = sfd_get;
+	c->stream.s_set   = sfd_set;
 
-	nni_posix_pfd_set_cb(c->pfd, fdc_cb, c);
+	nni_posix_pfd_set_cb(c->pfd, sfd_cb, c);
 
 	*cp = c;
 	return (0);
diff --git a/src/sp/transport/CMakeLists.txt b/src/sp/transport/CMakeLists.txt
index 95d67101f..0de80015d 100644
--- a/src/sp/transport/CMakeLists.txt
+++ b/src/sp/transport/CMakeLists.txt
@@ -10,7 +10,7 @@
 #  Transports.
 nng_directory(transport)
 
-add_subdirectory(fdconn)
+add_subdirectory(socket)
 add_subdirectory(inproc)
 add_subdirectory(ipc)
 add_subdirectory(tcp)
diff --git a/src/sp/transport/fdconn/CMakeLists.txt b/src/sp/transport/socket/CMakeLists.txt
similarity index 83%
rename from src/sp/transport/fdconn/CMakeLists.txt
rename to src/sp/transport/socket/CMakeLists.txt
index 264dd455c..d79b261e1 100644
--- a/src/sp/transport/fdconn/CMakeLists.txt
+++ b/src/sp/transport/socket/CMakeLists.txt
@@ -8,8 +8,8 @@
 #
 
 # File Descriptor (or Handle) based connections
-nng_directory(fdconn)
+nng_directory(socket)
 
-nng_sources_if(NNG_TRANSPORT_FDC fdconn.c)
+nng_sources_if(NNG_TRANSPORT_FDC sockfd.c)
 nng_defines_if(NNG_TRANSPORT_FDC NNG_TRANSPORT_FDC)
-nng_test(fdc_test)
\ No newline at end of file
+nng_test(sockfd_test)
\ No newline at end of file
diff --git a/src/sp/transport/fdconn/fdconn.c b/src/sp/transport/socket/sockfd.c
similarity index 100%
rename from src/sp/transport/fdconn/fdconn.c
rename to src/sp/transport/socket/sockfd.c
diff --git a/src/sp/transport/fdconn/fdc_test.c b/src/sp/transport/socket/sockfd_test.c
similarity index 100%
rename from src/sp/transport/fdconn/fdc_test.c
rename to src/sp/transport/socket/sockfd_test.c