diff --git a/include/block/nbd.h b/include/block/nbd.h
index 6d05983a55..bb9f5bc021 100644
--- a/include/block/nbd.h
+++ b/include/block/nbd.h
@@ -127,18 +127,32 @@ typedef struct NBDExtent {
 
 /* Transmission (export) flags: sent from server to client during handshake,
    but describe what will happen during transmission */
-#define NBD_FLAG_HAS_FLAGS         (1 << 0) /* Flags are there */
-#define NBD_FLAG_READ_ONLY         (1 << 1) /* Device is read-only */
-#define NBD_FLAG_SEND_FLUSH        (1 << 2) /* Send FLUSH */
-#define NBD_FLAG_SEND_FUA          (1 << 3) /* Send FUA (Force Unit Access) */
-#define NBD_FLAG_ROTATIONAL        (1 << 4) /* Use elevator algorithm -
-                                               rotational media */
-#define NBD_FLAG_SEND_TRIM         (1 << 5) /* Send TRIM (discard) */
-#define NBD_FLAG_SEND_WRITE_ZEROES (1 << 6) /* Send WRITE_ZEROES */
-#define NBD_FLAG_SEND_DF           (1 << 7) /* Send DF (Do not Fragment) */
-#define NBD_FLAG_CAN_MULTI_CONN    (1 << 8) /* Multi-client cache consistent */
-#define NBD_FLAG_SEND_RESIZE       (1 << 9) /* Send resize */
-#define NBD_FLAG_SEND_CACHE        (1 << 10) /* Send CACHE (prefetch) */
+enum {
+    NBD_FLAG_HAS_FLAGS_BIT          =  0, /* Flags are there */
+    NBD_FLAG_READ_ONLY_BIT          =  1, /* Device is read-only */
+    NBD_FLAG_SEND_FLUSH_BIT         =  2, /* Send FLUSH */
+    NBD_FLAG_SEND_FUA_BIT           =  3, /* Send FUA (Force Unit Access) */
+    NBD_FLAG_ROTATIONAL_BIT         =  4, /* Use elevator algorithm -
+                                             rotational media */
+    NBD_FLAG_SEND_TRIM_BIT          =  5, /* Send TRIM (discard) */
+    NBD_FLAG_SEND_WRITE_ZEROES_BIT  =  6, /* Send WRITE_ZEROES */
+    NBD_FLAG_SEND_DF_BIT            =  7, /* Send DF (Do not Fragment) */
+    NBD_FLAG_CAN_MULTI_CONN_BIT     =  8, /* Multi-client cache consistent */
+    NBD_FLAG_SEND_RESIZE_BIT        =  9, /* Send resize */
+    NBD_FLAG_SEND_CACHE_BIT         = 10, /* Send CACHE (prefetch) */
+};
+
+#define NBD_FLAG_HAS_FLAGS         (1 << NBD_FLAG_HAS_FLAGS_BIT)
+#define NBD_FLAG_READ_ONLY         (1 << NBD_FLAG_READ_ONLY_BIT)
+#define NBD_FLAG_SEND_FLUSH        (1 << NBD_FLAG_SEND_FLUSH_BIT)
+#define NBD_FLAG_SEND_FUA          (1 << NBD_FLAG_SEND_FUA_BIT)
+#define NBD_FLAG_ROTATIONAL        (1 << NBD_FLAG_ROTATIONAL_BIT)
+#define NBD_FLAG_SEND_TRIM         (1 << NBD_FLAG_SEND_TRIM_BIT)
+#define NBD_FLAG_SEND_WRITE_ZEROES (1 << NBD_FLAG_SEND_WRITE_ZEROES_BIT)
+#define NBD_FLAG_SEND_DF           (1 << NBD_FLAG_SEND_DF_BIT)
+#define NBD_FLAG_CAN_MULTI_CONN    (1 << NBD_FLAG_CAN_MULTI_CONN_BIT)
+#define NBD_FLAG_SEND_RESIZE       (1 << NBD_FLAG_SEND_RESIZE_BIT)
+#define NBD_FLAG_SEND_CACHE        (1 << NBD_FLAG_SEND_CACHE_BIT)
 
 /* New-style handshake (global) flags, sent from server to client, and
    control what will happen during handshake phase. */
diff --git a/qemu-nbd.c b/qemu-nbd.c
index dca9e72cee..081fcf74d5 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -279,37 +279,25 @@ static int qemu_nbd_client_list(SocketAddress *saddr, QCryptoTLSCreds *tls,
             printf("  description: %s\n", list[i].description);
         }
         if (list[i].flags & NBD_FLAG_HAS_FLAGS) {
+            static const char *const flag_names[] = {
+                [NBD_FLAG_READ_ONLY_BIT]            = "readonly",
+                [NBD_FLAG_SEND_FLUSH_BIT]           = "flush",
+                [NBD_FLAG_SEND_FUA_BIT]             = "fua",
+                [NBD_FLAG_ROTATIONAL_BIT]           = "rotational",
+                [NBD_FLAG_SEND_TRIM_BIT]            = "trim",
+                [NBD_FLAG_SEND_WRITE_ZEROES_BIT]    = "zeroes",
+                [NBD_FLAG_SEND_DF_BIT]              = "df",
+                [NBD_FLAG_CAN_MULTI_CONN_BIT]       = "multi",
+                [NBD_FLAG_SEND_RESIZE_BIT]          = "resize",
+                [NBD_FLAG_SEND_CACHE_BIT]           = "cache",
+            };
+
             printf("  size:  %" PRIu64 "\n", list[i].size);
             printf("  flags: 0x%x (", list[i].flags);
-            if (list[i].flags & NBD_FLAG_READ_ONLY) {
-                printf(" readonly");
-            }
-            if (list[i].flags & NBD_FLAG_SEND_FLUSH) {
-                printf(" flush");
-            }
-            if (list[i].flags & NBD_FLAG_SEND_FUA) {
-                printf(" fua");
-            }
-            if (list[i].flags & NBD_FLAG_ROTATIONAL) {
-                printf(" rotational");
-            }
-            if (list[i].flags & NBD_FLAG_SEND_TRIM) {
-                printf(" trim");
-            }
-            if (list[i].flags & NBD_FLAG_SEND_WRITE_ZEROES) {
-                printf(" zeroes");
-            }
-            if (list[i].flags & NBD_FLAG_SEND_DF) {
-                printf(" df");
-            }
-            if (list[i].flags & NBD_FLAG_CAN_MULTI_CONN) {
-                printf(" multi");
-            }
-            if (list[i].flags & NBD_FLAG_SEND_RESIZE) {
-                printf(" resize");
-            }
-            if (list[i].flags & NBD_FLAG_SEND_CACHE) {
-                printf(" cache");
+            for (size_t bit = 0; bit < ARRAY_SIZE(flag_names); bit++) {
+                if (flag_names[bit] && (list[i].flags & (1 << bit))) {
+                    printf(" %s", flag_names[bit]);
+                }
             }
             printf(" )\n");
         }
diff --git a/tests/qemu-iotests/059.out b/tests/qemu-iotests/059.out
index 700ad1f290..f51394ae8e 100644
--- a/tests/qemu-iotests/059.out
+++ b/tests/qemu-iotests/059.out
@@ -2,15 +2,15 @@ QA output created by 059
 
 === Testing invalid granularity ===
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
-can't open device TEST_DIR/t.vmdk: Invalid granularity, image may be corrupt
+qemu-io: can't open device TEST_DIR/t.vmdk: Invalid granularity, image may be corrupt
 
 === Testing too big L2 table size ===
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
-can't open device TEST_DIR/t.vmdk: L2 table size too big
+qemu-io: can't open device TEST_DIR/t.vmdk: L2 table size too big
 
 === Testing too big L1 table size ===
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
-can't open device TEST_DIR/t.vmdk: L1 size too big
+qemu-io: can't open device TEST_DIR/t.vmdk: L1 size too big
 
 === Testing monolithicFlat creation and opening ===
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=2147483648 subformat=monolithicFlat
@@ -2050,7 +2050,7 @@ wrote 512/512 bytes at offset 10240
 
 === Testing monolithicFlat with internally generated JSON file name ===
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 subformat=monolithicFlat
-can't open: Cannot use relative extent paths with VMDK descriptor file 'json:{"image": {"driver": "file", "filename": "TEST_DIR/t.IMGFMT"}, "driver": "blkdebug", "inject-error.0.event": "read_aio"}'
+qemu-io: can't open: Cannot use relative extent paths with VMDK descriptor file 'json:{"image": {"driver": "file", "filename": "TEST_DIR/t.IMGFMT"}, "driver": "blkdebug", "inject-error.0.event": "read_aio"}'
 
 === Testing version 3 ===
 image: TEST_DIR/iotest-version3.IMGFMT
diff --git a/tests/qemu-iotests/083.out b/tests/qemu-iotests/083.out
index 7419722cd7..eee6dd1379 100644
--- a/tests/qemu-iotests/083.out
+++ b/tests/qemu-iotests/083.out
@@ -1,43 +1,43 @@
 QA output created by 083
 === Check disconnect before neg1 ===
 
-can't open device nbd+tcp://127.0.0.1:PORT/foo
+qemu-io: can't open device nbd+tcp://127.0.0.1:PORT/foo
 
 === Check disconnect after neg1 ===
 
-can't open device nbd+tcp://127.0.0.1:PORT/foo
+qemu-io: can't open device nbd+tcp://127.0.0.1:PORT/foo
 
 === Check disconnect 8 neg1 ===
 
-can't open device nbd+tcp://127.0.0.1:PORT/foo
+qemu-io: can't open device nbd+tcp://127.0.0.1:PORT/foo
 
 === Check disconnect 16 neg1 ===
 
-can't open device nbd+tcp://127.0.0.1:PORT/foo
+qemu-io: can't open device nbd+tcp://127.0.0.1:PORT/foo
 
 === Check disconnect before export ===
 
-can't open device nbd+tcp://127.0.0.1:PORT/foo
+qemu-io: can't open device nbd+tcp://127.0.0.1:PORT/foo
 
 === Check disconnect after export ===
 
-can't open device nbd+tcp://127.0.0.1:PORT/foo
+qemu-io: can't open device nbd+tcp://127.0.0.1:PORT/foo
 
 === Check disconnect 4 export ===
 
-can't open device nbd+tcp://127.0.0.1:PORT/foo
+qemu-io: can't open device nbd+tcp://127.0.0.1:PORT/foo
 
 === Check disconnect 12 export ===
 
-can't open device nbd+tcp://127.0.0.1:PORT/foo
+qemu-io: can't open device nbd+tcp://127.0.0.1:PORT/foo
 
 === Check disconnect 16 export ===
 
-can't open device nbd+tcp://127.0.0.1:PORT/foo
+qemu-io: can't open device nbd+tcp://127.0.0.1:PORT/foo
 
 === Check disconnect before neg2 ===
 
-can't open device nbd+tcp://127.0.0.1:PORT/foo
+qemu-io: can't open device nbd+tcp://127.0.0.1:PORT/foo
 
 === Check disconnect after neg2 ===
 
@@ -45,11 +45,11 @@ read failed: Input/output error
 
 === Check disconnect 8 neg2 ===
 
-can't open device nbd+tcp://127.0.0.1:PORT/foo
+qemu-io: can't open device nbd+tcp://127.0.0.1:PORT/foo
 
 === Check disconnect 10 neg2 ===
 
-can't open device nbd+tcp://127.0.0.1:PORT/foo
+qemu-io: can't open device nbd+tcp://127.0.0.1:PORT/foo
 
 === Check disconnect before request ===
 
@@ -86,23 +86,23 @@ read 512/512 bytes at offset 0
 
 === Check disconnect before neg-classic ===
 
-can't open device nbd+tcp://127.0.0.1:PORT/
+qemu-io: can't open device nbd+tcp://127.0.0.1:PORT/
 
 === Check disconnect 8 neg-classic ===
 
-can't open device nbd+tcp://127.0.0.1:PORT/
+qemu-io: can't open device nbd+tcp://127.0.0.1:PORT/
 
 === Check disconnect 16 neg-classic ===
 
-can't open device nbd+tcp://127.0.0.1:PORT/
+qemu-io: can't open device nbd+tcp://127.0.0.1:PORT/
 
 === Check disconnect 24 neg-classic ===
 
-can't open device nbd+tcp://127.0.0.1:PORT/
+qemu-io: can't open device nbd+tcp://127.0.0.1:PORT/
 
 === Check disconnect 28 neg-classic ===
 
-can't open device nbd+tcp://127.0.0.1:PORT/
+qemu-io: can't open device nbd+tcp://127.0.0.1:PORT/
 
 === Check disconnect after neg-classic ===
 
@@ -110,43 +110,43 @@ read failed: Input/output error
 
 === Check disconnect before neg1 ===
 
-can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
+qemu-io: can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
 
 === Check disconnect after neg1 ===
 
-can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
+qemu-io: can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
 
 === Check disconnect 8 neg1 ===
 
-can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
+qemu-io: can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
 
 === Check disconnect 16 neg1 ===
 
-can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
+qemu-io: can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
 
 === Check disconnect before export ===
 
-can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
+qemu-io: can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
 
 === Check disconnect after export ===
 
-can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
+qemu-io: can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
 
 === Check disconnect 4 export ===
 
-can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
+qemu-io: can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
 
 === Check disconnect 12 export ===
 
-can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
+qemu-io: can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
 
 === Check disconnect 16 export ===
 
-can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
+qemu-io: can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
 
 === Check disconnect before neg2 ===
 
-can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
+qemu-io: can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
 
 === Check disconnect after neg2 ===
 
@@ -154,11 +154,11 @@ read failed: Input/output error
 
 === Check disconnect 8 neg2 ===
 
-can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
+qemu-io: can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
 
 === Check disconnect 10 neg2 ===
 
-can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
+qemu-io: can't open device nbd+unix:///foo?socket=TEST_DIR/nbd.sock
 
 === Check disconnect before request ===
 
@@ -195,23 +195,23 @@ read 512/512 bytes at offset 0
 
 === Check disconnect before neg-classic ===
 
-can't open device nbd+unix:///?socket=TEST_DIR/nbd.sock
+qemu-io: can't open device nbd+unix:///?socket=TEST_DIR/nbd.sock
 
 === Check disconnect 8 neg-classic ===
 
-can't open device nbd+unix:///?socket=TEST_DIR/nbd.sock
+qemu-io: can't open device nbd+unix:///?socket=TEST_DIR/nbd.sock
 
 === Check disconnect 16 neg-classic ===
 
-can't open device nbd+unix:///?socket=TEST_DIR/nbd.sock
+qemu-io: can't open device nbd+unix:///?socket=TEST_DIR/nbd.sock
 
 === Check disconnect 24 neg-classic ===
 
-can't open device nbd+unix:///?socket=TEST_DIR/nbd.sock
+qemu-io: can't open device nbd+unix:///?socket=TEST_DIR/nbd.sock
 
 === Check disconnect 28 neg-classic ===
 
-can't open device nbd+unix:///?socket=TEST_DIR/nbd.sock
+qemu-io: can't open device nbd+unix:///?socket=TEST_DIR/nbd.sock
 
 === Check disconnect after neg-classic ===
 
diff --git a/tests/qemu-iotests/092.out b/tests/qemu-iotests/092.out
index 6eda321fc6..3e79914873 100644
--- a/tests/qemu-iotests/092.out
+++ b/tests/qemu-iotests/092.out
@@ -2,25 +2,25 @@ QA output created by 092
 
 == Invalid cluster size ==
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
-can't open device TEST_DIR/t.qcow: Cluster size must be between 512 and 64k
-can't open device TEST_DIR/t.qcow: Cluster size must be between 512 and 64k
-can't open device TEST_DIR/t.qcow: Cluster size must be between 512 and 64k
-can't open device TEST_DIR/t.qcow: Cluster size must be between 512 and 64k
+qemu-io: can't open device TEST_DIR/t.qcow: Cluster size must be between 512 and 64k
+qemu-io: can't open device TEST_DIR/t.qcow: Cluster size must be between 512 and 64k
+qemu-io: can't open device TEST_DIR/t.qcow: Cluster size must be between 512 and 64k
+qemu-io: can't open device TEST_DIR/t.qcow: Cluster size must be between 512 and 64k
 
 == Invalid L2 table size ==
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
-can't open device TEST_DIR/t.qcow: L2 table size must be between 512 and 64k
-can't open device TEST_DIR/t.qcow: L2 table size must be between 512 and 64k
-can't open device TEST_DIR/t.qcow: L2 table size must be between 512 and 64k
-can't open device TEST_DIR/t.qcow: L2 table size must be between 512 and 64k
+qemu-io: can't open device TEST_DIR/t.qcow: L2 table size must be between 512 and 64k
+qemu-io: can't open device TEST_DIR/t.qcow: L2 table size must be between 512 and 64k
+qemu-io: can't open device TEST_DIR/t.qcow: L2 table size must be between 512 and 64k
+qemu-io: can't open device TEST_DIR/t.qcow: L2 table size must be between 512 and 64k
 
 == Invalid size ==
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
-can't open device TEST_DIR/t.qcow: Image too large
-can't open device TEST_DIR/t.qcow: Image too large
+qemu-io: can't open device TEST_DIR/t.qcow: Image too large
+qemu-io: can't open device TEST_DIR/t.qcow: Image too large
 
 == Invalid backing file length ==
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
-can't open device TEST_DIR/t.qcow: Backing file name too long
-can't open device TEST_DIR/t.qcow: Backing file name too long
+qemu-io: can't open device TEST_DIR/t.qcow: Backing file name too long
+qemu-io: can't open device TEST_DIR/t.qcow: Backing file name too long
 *** done
diff --git a/tests/qemu-iotests/182 b/tests/qemu-iotests/182
index ff3d7e7ec1..38959bf276 100755
--- a/tests/qemu-iotests/182
+++ b/tests/qemu-iotests/182
@@ -31,6 +31,7 @@ _cleanup()
 {
     _cleanup_test_img
     rm -f "$TEST_IMG.overlay"
+    rm -f "$TEST_DIR/nbd.socket"
 }
 trap "_cleanup; exit \$status" 0 1 2 3 15
 
@@ -126,15 +127,26 @@ success_or_failure=y _send_qemu_cmd $QEMU_HANDLE \
     'return' \
     'error'
 
-# Now we attach the image to a virtio-blk device.  This device does
-# require some permissions (at least WRITE and READ_CONSISTENT), so if
+# Start an NBD server to which we can attach node1
+success_or_failure=y _send_qemu_cmd $QEMU_HANDLE \
+    "{'execute': 'nbd-server-start',
+      'arguments': {
+          'addr': {
+              'type': 'unix',
+              'data': {
+                  'path': '$TEST_DIR/nbd.socket'
+              } } } }" \
+    'return' \
+    'error'
+
+# Now we attach the image to the NBD server.  This server does require
+# some permissions (at least WRITE and READ_CONSISTENT), so if
 # reopening node0 unshared any (which it should not have), this will
 # fail (but it should not).
 success_or_failure=y _send_qemu_cmd $QEMU_HANDLE \
-    "{'execute': 'device_add',
+    "{'execute': 'nbd-server-add',
       'arguments': {
-          'driver': 'virtio-blk',
-          'drive': 'node1'
+          'device': 'node1'
       } }" \
     'return' \
     'error'
diff --git a/tests/qemu-iotests/182.out b/tests/qemu-iotests/182.out
index af501ca3f3..33d41eea91 100644
--- a/tests/qemu-iotests/182.out
+++ b/tests/qemu-iotests/182.out
@@ -14,4 +14,5 @@ Formatting 'TEST_DIR/t.qcow2.overlay', fmt=qcow2 size=197120 backing_file=TEST_D
 {"return": {}}
 {"return": {}}
 {"return": {}}
+{"return": {}}
 *** done
diff --git a/tests/qemu-iotests/221 b/tests/qemu-iotests/221
index 808cd9a289..25dd47bcfe 100755
--- a/tests/qemu-iotests/221
+++ b/tests/qemu-iotests/221
@@ -2,7 +2,7 @@
 #
 # Test qemu-img vs. unaligned images
 #
-# Copyright (C) 2018 Red Hat, Inc.
+# Copyright (C) 2018-2019 Red Hat, Inc.
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -41,16 +41,16 @@ echo
 echo "=== Check mapping of unaligned raw image ==="
 echo
 
-_make_test_img 43009 # qemu-img create rounds size up
+_make_test_img 65537 # qemu-img create rounds size up
 $QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
 
-truncate --size=43009 "$TEST_IMG" # so we resize it and check again
+truncate --size=65537 "$TEST_IMG" # so we resize it and check again
 $QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
 
-$QEMU_IO -c 'w 43008 1' "$TEST_IMG" | _filter_qemu_io # writing also rounds up
+$QEMU_IO -c 'w 65536 1' "$TEST_IMG" | _filter_qemu_io # writing also rounds up
 $QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
 
-truncate --size=43009 "$TEST_IMG" # so we resize it and check again
+truncate --size=65537 "$TEST_IMG" # so we resize it and check again
 $QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
 
 # success, all done
diff --git a/tests/qemu-iotests/221.out b/tests/qemu-iotests/221.out
index a9c0190aad..9f9dd52bb0 100644
--- a/tests/qemu-iotests/221.out
+++ b/tests/qemu-iotests/221.out
@@ -2,15 +2,15 @@ QA output created by 221
 
 === Check mapping of unaligned raw image ===
 
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=43009
-[{ "start": 0, "length": 43520, "depth": 0, "zero": true, "data": false, "offset": OFFSET}]
-[{ "start": 0, "length": 43520, "depth": 0, "zero": true, "data": false, "offset": OFFSET}]
-wrote 1/1 bytes at offset 43008
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=65537
+[{ "start": 0, "length": 66048, "depth": 0, "zero": true, "data": false, "offset": OFFSET}]
+[{ "start": 0, "length": 66048, "depth": 0, "zero": true, "data": false, "offset": OFFSET}]
+wrote 1/1 bytes at offset 65536
 1 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-[{ "start": 0, "length": 40960, "depth": 0, "zero": true, "data": false, "offset": OFFSET},
-{ "start": 40960, "length": 2049, "depth": 0, "zero": false, "data": true, "offset": OFFSET},
-{ "start": 43009, "length": 511, "depth": 0, "zero": true, "data": false, "offset": OFFSET}]
-[{ "start": 0, "length": 40960, "depth": 0, "zero": true, "data": false, "offset": OFFSET},
-{ "start": 40960, "length": 2049, "depth": 0, "zero": false, "data": true, "offset": OFFSET},
-{ "start": 43009, "length": 511, "depth": 0, "zero": true, "data": false, "offset": OFFSET}]
+[{ "start": 0, "length": 65536, "depth": 0, "zero": true, "data": false, "offset": OFFSET},
+{ "start": 65536, "length": 1, "depth": 0, "zero": false, "data": true, "offset": OFFSET},
+{ "start": 65537, "length": 511, "depth": 0, "zero": true, "data": false, "offset": OFFSET}]
+[{ "start": 0, "length": 65536, "depth": 0, "zero": true, "data": false, "offset": OFFSET},
+{ "start": 65536, "length": 1, "depth": 0, "zero": false, "data": true, "offset": OFFSET},
+{ "start": 65537, "length": 511, "depth": 0, "zero": true, "data": false, "offset": OFFSET}]
 *** done
diff --git a/tests/qemu-iotests/233 b/tests/qemu-iotests/233
index b8b6c8cc4c..41b4d46560 100755
--- a/tests/qemu-iotests/233
+++ b/tests/qemu-iotests/233
@@ -139,11 +139,13 @@ nbd_server_start_tcp_socket \
 
 $QEMU_IMG info --image-opts \
     --object tls-creds-x509,dir=${tls_dir}/client1,endpoint=client,id=tls0 \
-    driver=nbd,host=$nbd_tcp_addr,port=$nbd_tcp_port,tls-creds=tls0
+    driver=nbd,host=$nbd_tcp_addr,port=$nbd_tcp_port,tls-creds=tls0 \
+    2>&1 | sed "s/$nbd_tcp_port/PORT/g"
 
 $QEMU_IMG info --image-opts \
     --object tls-creds-x509,dir=${tls_dir}/client3,endpoint=client,id=tls0 \
-    driver=nbd,host=$nbd_tcp_addr,port=$nbd_tcp_port,tls-creds=tls0
+    driver=nbd,host=$nbd_tcp_addr,port=$nbd_tcp_port,tls-creds=tls0 \
+    2>&1 | sed "s/$nbd_tcp_port/PORT/g"
 
 echo
 echo "== final server log =="
diff --git a/tests/qemu-iotests/233.out b/tests/qemu-iotests/233.out
index 4edc2dd5cf..9b46284ab0 100644
--- a/tests/qemu-iotests/233.out
+++ b/tests/qemu-iotests/233.out
@@ -57,8 +57,8 @@ read 1048576/1048576 bytes at offset 1048576
 1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 
 == check TLS with authorization ==
-qemu-img: Could not open 'driver=nbd,host=127.0.0.1,port=10809,tls-creds=tls0': Failed to read option reply: Cannot read from TLS channel: Software caused connection abort
-qemu-img: Could not open 'driver=nbd,host=127.0.0.1,port=10809,tls-creds=tls0': Failed to read option reply: Cannot read from TLS channel: Software caused connection abort
+qemu-img: Could not open 'driver=nbd,host=127.0.0.1,port=PORT,tls-creds=tls0': Failed to read option reply: Cannot read from TLS channel: Software caused connection abort
+qemu-img: Could not open 'driver=nbd,host=127.0.0.1,port=PORT,tls-creds=tls0': Failed to read option reply: Cannot read from TLS channel: Software caused connection abort
 
 == final server log ==
 qemu-nbd: option negotiation failed: Verify failed: No certificate was found.