diff --git a/NEWS b/NEWS
index 4be0678c..dcdf8824 100644
--- a/NEWS
+++ b/NEWS
@@ -62,6 +62,7 @@ NEWS
   * use li_[iu]tostrn() instead of li_[iu]tostr()
   * [stream] fstat() after open() to obtain file size
   * [core] clean up srv before exiting for lighttpd -[vVh]
+  * [mod_fastcgi,mod_scgi] check for spawning on same unix socket (fixes #319)
 
 - 1.4.39 - 2016-01-02
   * [core] fix memset_s call (fixes #2698)
diff --git a/src/mod_fastcgi.c b/src/mod_fastcgi.c
index a568e2a5..8ab215a4 100644
--- a/src/mod_fastcgi.c
+++ b/src/mod_fastcgi.c
@@ -1167,6 +1167,24 @@ static int fcgi_spawn_connection(server *srv,
 
 #endif /* HAVE_FORK */
 
+static int unixsocket_is_dup(plugin_data *p, size_t used, buffer *unixsocket) {
+	size_t i, j, n;
+	for (i = 0; i < used; ++i) {
+		fcgi_exts *exts = p->config_storage[i]->exts;
+		for (j = 0; j < exts->used; ++j) {
+			fcgi_extension *ex = exts->exts[j];
+			for (n = 0; n < ex->used; ++n) {
+				fcgi_extension_host *host = ex->hosts[n];
+				if (!buffer_string_is_empty(host->unixsocket)
+				    && buffer_is_equal(host->unixsocket, unixsocket))
+					return 1;
+			}
+		}
+	}
+
+	return 0;
+}
+
 SETDEFAULTS_FUNC(mod_fastcgi_set_defaults) {
 	plugin_data *p = p_d;
 	data_unset *du;
@@ -1344,6 +1362,14 @@ SETDEFAULTS_FUNC(mod_fastcgi_set_defaults) {
 
 							goto error;
 						}
+
+						if (!buffer_string_is_empty(host->bin_path)
+						    && unixsocket_is_dup(p, i+1, host->unixsocket)) {
+							log_error_write(srv, __FILE__, __LINE__, "sb",
+									"duplicate unixsocket path:",
+									host->unixsocket);
+							goto error;
+						}
 					} else {
 						/* tcp/ip */
 
diff --git a/src/mod_scgi.c b/src/mod_scgi.c
index c1996cf8..a4a8e0ac 100644
--- a/src/mod_scgi.c
+++ b/src/mod_scgi.c
@@ -677,6 +677,7 @@ static int scgi_spawn_connection(server *srv,
 				"new proc, socket:", proc->port, proc->socket);
 	}
 
+
 	if (!buffer_string_is_empty(proc->socket)) {
 #ifdef HAVE_SYS_UN_H
 		memset(&scgi_addr_un, 0, sizeof(scgi_addr_un));
@@ -936,6 +937,24 @@ static int scgi_spawn_connection(server *srv,
 
 #endif /* HAVE_FORK */
 
+static int unixsocket_is_dup(plugin_data *p, size_t used, buffer *unixsocket) {
+	size_t i, j, n;
+	for (i = 0; i < used; ++i) {
+		scgi_exts *exts = p->config_storage[i]->exts;
+		for (j = 0; j < exts->used; ++j) {
+			scgi_extension *ex = exts->exts[j];
+			for (n = 0; n < ex->used; ++n) {
+				scgi_extension_host *host = ex->hosts[n];
+				if (!buffer_string_is_empty(host->unixsocket)
+				    && buffer_is_equal(host->unixsocket, unixsocket))
+					return 1;
+			}
+		}
+	}
+
+	return 0;
+}
+
 SETDEFAULTS_FUNC(mod_scgi_set_defaults) {
 	plugin_data *p = p_d;
 	data_unset *du;
@@ -1097,6 +1116,14 @@ SETDEFAULTS_FUNC(mod_scgi_set_defaults) {
 									"path of the unixdomain socket is too large");
 							goto error;
 						}
+
+						if (!buffer_string_is_empty(df->bin_path)
+						    && unixsocket_is_dup(p, i+1, df->unixsocket)) {
+							log_error_write(srv, __FILE__, __LINE__, "sb",
+									"duplicate unixsocket path:",
+									df->unixsocket);
+							goto error;
+						}
 					} else {
 						/* tcp/ip */