diff --git a/src/http/v3/ngx_http_v3.c b/src/http/v3/ngx_http_v3.c
index 500113509..97d8a5e34 100644
--- a/src/http/v3/ngx_http_v3.c
+++ b/src/http/v3/ngx_http_v3.c
@@ -33,7 +33,7 @@ ngx_http_v3_init_session(ngx_connection_t *c)
 
     h3c = ngx_pcalloc(pc->pool, sizeof(ngx_http_v3_session_t));
     if (h3c == NULL) {
-        return NGX_ERROR;
+        goto failed;
     }
 
     h3c->max_push_id = (uint64_t) -1;
@@ -49,7 +49,7 @@ ngx_http_v3_init_session(ngx_connection_t *c)
 
     cln = ngx_pool_cleanup_add(pc->pool, 0);
     if (cln == NULL) {
-        return NGX_ERROR;
+        goto failed;
     }
 
     cln->handler = ngx_http_v3_cleanup_session;
@@ -58,6 +58,14 @@ ngx_http_v3_init_session(ngx_connection_t *c)
     hc->v3_session = h3c;
 
     return ngx_http_v3_send_settings(c);
+
+failed:
+
+    ngx_log_error(NGX_LOG_ERR, c->log, 0, "failed to create http3 session");
+
+    ngx_http_v3_finalize_connection(c, NGX_HTTP_V3_ERR_INTERNAL_ERROR,
+                                    "failed to create http3 session");
+    return NGX_ERROR;
 }
 
 
diff --git a/src/http/v3/ngx_http_v3_request.c b/src/http/v3/ngx_http_v3_request.c
index bb9a72248..5c905bc3a 100644
--- a/src/http/v3/ngx_http_v3_request.c
+++ b/src/http/v3/ngx_http_v3_request.c
@@ -65,8 +65,6 @@ ngx_http_v3_init(ngx_connection_t *c)
     ngx_http_core_srv_conf_t  *cscf;
 
     if (ngx_http_v3_init_session(c) != NGX_OK) {
-        ngx_http_v3_finalize_connection(c, NGX_HTTP_V3_ERR_INTERNAL_ERROR,
-                                        "internal error");
         ngx_http_close_connection(c);
         return;
     }
@@ -110,8 +108,6 @@ ngx_http_v3_init(ngx_connection_t *c)
         h3c->goaway = 1;
 
         if (ngx_http_v3_send_goaway(c, (n + 1) << 2) != NGX_OK) {
-            ngx_http_v3_finalize_connection(c, NGX_HTTP_V3_ERR_INTERNAL_ERROR,
-                                            "goaway error");
             ngx_http_close_connection(c);
             return;
         }
@@ -287,15 +283,14 @@ ngx_http_v3_process_request(ngx_event_t *rev)
         rc = ngx_http_v3_parse_headers(c, st, b);
 
         if (rc > 0) {
-            ngx_http_v3_finalize_connection(c, rc,
-                                            "could not parse request headers");
+            ngx_quic_reset_stream(c, rc);
+            ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
+                          "client sent invalid header");
             ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);
             break;
         }
 
         if (rc == NGX_ERROR) {
-            ngx_http_v3_finalize_connection(c, NGX_HTTP_V3_ERR_INTERNAL_ERROR,
-                                            "internal error");
             ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
             break;
         }
@@ -1167,17 +1162,13 @@ ngx_http_v3_request_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
                 }
 
                 if (rc > 0) {
-                    ngx_http_v3_finalize_connection(r->connection, rc,
-                                                   "client sent invalid body");
+                    ngx_quic_reset_stream(r->connection, rc);
                     ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                                   "client sent invalid body");
                     return NGX_HTTP_BAD_REQUEST;
                 }
 
                 if (rc == NGX_ERROR) {
-                    ngx_http_v3_finalize_connection(r->connection,
-                                                NGX_HTTP_V3_ERR_INTERNAL_ERROR,
-                                                "internal error");
                     return NGX_HTTP_INTERNAL_SERVER_ERROR;
                 }
 
diff --git a/src/http/v3/ngx_http_v3_streams.c b/src/http/v3/ngx_http_v3_streams.c
index 2ff1320ae..257ec317a 100644
--- a/src/http/v3/ngx_http_v3_streams.c
+++ b/src/http/v3/ngx_http_v3_streams.c
@@ -283,7 +283,7 @@ ngx_http_v3_create_push_stream(ngx_connection_t *c, uint64_t push_id)
 
     sc = ngx_quic_open_stream(c, 0);
     if (sc == NULL) {
-        return NULL;
+        goto failed;
     }
 
     p = buf;
@@ -318,7 +318,13 @@ ngx_http_v3_create_push_stream(ngx_connection_t *c, uint64_t push_id)
 
 failed:
 
-    ngx_http_v3_close_uni_stream(sc);
+    ngx_log_error(NGX_LOG_ERR, c->log, 0, "failed to create push stream");
+
+    ngx_http_v3_finalize_connection(c, NGX_HTTP_V3_ERR_STREAM_CREATION_ERROR,
+                                    "failed to create push stream");
+    if (sc) {
+        ngx_http_v3_close_uni_stream(sc);
+    }
 
     return NULL;
 }
@@ -368,7 +374,7 @@ ngx_http_v3_get_uni_stream(ngx_connection_t *c, ngx_uint_t type)
 
     sc = ngx_quic_open_stream(c, 0);
     if (sc == NULL) {
-        return NULL;
+        goto failed;
     }
 
     sc->quic->cancelable = 1;
@@ -405,7 +411,13 @@ ngx_http_v3_get_uni_stream(ngx_connection_t *c, ngx_uint_t type)
 
 failed:
 
-    ngx_http_v3_close_uni_stream(sc);
+    ngx_log_error(NGX_LOG_ERR, c->log, 0, "failed to create server stream");
+
+    ngx_http_v3_finalize_connection(c, NGX_HTTP_V3_ERR_STREAM_CREATION_ERROR,
+                                    "failed to create server stream");
+    if (sc) {
+        ngx_http_v3_close_uni_stream(sc);
+    }
 
     return NULL;
 }
@@ -424,7 +436,7 @@ ngx_http_v3_send_settings(ngx_connection_t *c)
 
     cc = ngx_http_v3_get_uni_stream(c, NGX_HTTP_V3_STREAM_CONTROL);
     if (cc == NULL) {
-        return NGX_DECLINED;
+        return NGX_ERROR;
     }
 
     h3scf = ngx_http_v3_get_module_srv_conf(c, ngx_http_v3_module);
@@ -457,6 +469,10 @@ ngx_http_v3_send_settings(ngx_connection_t *c)
 
 failed:
 
+    ngx_log_error(NGX_LOG_ERR, c->log, 0, "failed to send settings");
+
+    ngx_http_v3_finalize_connection(c, NGX_HTTP_V3_ERR_EXCESSIVE_LOAD,
+                                    "failed to send settings");
     ngx_http_v3_close_uni_stream(cc);
 
     return NGX_ERROR;
@@ -475,7 +491,7 @@ ngx_http_v3_send_goaway(ngx_connection_t *c, uint64_t id)
 
     cc = ngx_http_v3_get_uni_stream(c, NGX_HTTP_V3_STREAM_CONTROL);
     if (cc == NULL) {
-        return NGX_DECLINED;
+        return NGX_ERROR;
     }
 
     n = ngx_http_v3_encode_varlen_int(NULL, id);
@@ -495,6 +511,10 @@ ngx_http_v3_send_goaway(ngx_connection_t *c, uint64_t id)
 
 failed:
 
+    ngx_log_error(NGX_LOG_ERR, c->log, 0, "failed to send goaway");
+
+    ngx_http_v3_finalize_connection(c, NGX_HTTP_V3_ERR_EXCESSIVE_LOAD,
+                                    "failed to send goaway");
     ngx_http_v3_close_uni_stream(cc);
 
     return NGX_ERROR;
@@ -510,7 +530,7 @@ ngx_http_v3_send_ack_section(ngx_connection_t *c, ngx_uint_t stream_id)
     ngx_http_v3_session_t  *h3c;
 
     ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
-                   "http3 client ack section %ui", stream_id);
+                   "http3 send section acknowledgement %ui", stream_id);
 
     dc = ngx_http_v3_get_uni_stream(c, NGX_HTTP_V3_STREAM_DECODER);
     if (dc == NULL) {
@@ -524,11 +544,21 @@ ngx_http_v3_send_ack_section(ngx_connection_t *c, ngx_uint_t stream_id)
     h3c->total_bytes += n;
 
     if (dc->send(dc, buf, n) != (ssize_t) n) {
-        ngx_http_v3_close_uni_stream(dc);
-        return NGX_ERROR;
+        goto failed;
     }
 
     return NGX_OK;
+
+failed:
+
+    ngx_log_error(NGX_LOG_ERR, c->log, 0,
+                  "failed to send section acknowledgement");
+
+    ngx_http_v3_finalize_connection(c, NGX_HTTP_V3_ERR_EXCESSIVE_LOAD,
+                                    "failed to send section acknowledgement");
+    ngx_http_v3_close_uni_stream(dc);
+
+    return NGX_ERROR;
 }
 
 
@@ -541,7 +571,7 @@ ngx_http_v3_send_cancel_stream(ngx_connection_t *c, ngx_uint_t stream_id)
     ngx_http_v3_session_t  *h3c;
 
     ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
-                   "http3 client cancel stream %ui", stream_id);
+                   "http3 send stream cancellation %ui", stream_id);
 
     dc = ngx_http_v3_get_uni_stream(c, NGX_HTTP_V3_STREAM_DECODER);
     if (dc == NULL) {
@@ -555,11 +585,20 @@ ngx_http_v3_send_cancel_stream(ngx_connection_t *c, ngx_uint_t stream_id)
     h3c->total_bytes += n;
 
     if (dc->send(dc, buf, n) != (ssize_t) n) {
-        ngx_http_v3_close_uni_stream(dc);
-        return NGX_ERROR;
+        goto failed;
     }
 
     return NGX_OK;
+
+failed:
+
+    ngx_log_error(NGX_LOG_ERR, c->log, 0, "failed to send stream cancellation");
+
+    ngx_http_v3_finalize_connection(c, NGX_HTTP_V3_ERR_EXCESSIVE_LOAD,
+                                    "failed to send stream cancellation");
+    ngx_http_v3_close_uni_stream(dc);
+
+    return NGX_ERROR;
 }
 
 
@@ -572,7 +611,7 @@ ngx_http_v3_send_inc_insert_count(ngx_connection_t *c, ngx_uint_t inc)
     ngx_http_v3_session_t  *h3c;
 
     ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
-                   "http3 client increment insert count %ui", inc);
+                   "http3 send insert count increment %ui", inc);
 
     dc = ngx_http_v3_get_uni_stream(c, NGX_HTTP_V3_STREAM_DECODER);
     if (dc == NULL) {
@@ -586,11 +625,21 @@ ngx_http_v3_send_inc_insert_count(ngx_connection_t *c, ngx_uint_t inc)
     h3c->total_bytes += n;
 
     if (dc->send(dc, buf, n) != (ssize_t) n) {
-        ngx_http_v3_close_uni_stream(dc);
-        return NGX_ERROR;
+        goto failed;
     }
 
     return NGX_OK;
+
+failed:
+
+    ngx_log_error(NGX_LOG_ERR, c->log, 0,
+                  "failed to send insert count increment");
+
+    ngx_http_v3_finalize_connection(c, NGX_HTTP_V3_ERR_EXCESSIVE_LOAD,
+                                    "failed to send insert count increment");
+    ngx_http_v3_close_uni_stream(dc);
+
+    return NGX_ERROR;
 }
 
 
diff --git a/src/http/v3/ngx_http_v3_tables.c b/src/http/v3/ngx_http_v3_tables.c
index 348088774..c6d543ac4 100644
--- a/src/http/v3/ngx_http_v3_tables.c
+++ b/src/http/v3/ngx_http_v3_tables.c
@@ -589,6 +589,10 @@ ngx_http_v3_check_insert_count(ngx_connection_t *c, ngx_uint_t insert_count)
         if (h3c->nblocked == h3scf->max_blocked_streams) {
             ngx_log_error(NGX_LOG_INFO, c->log, 0,
                           "client exceeded http3_max_blocked_streams limit");
+
+            ngx_http_v3_finalize_connection(c,
+                                          NGX_HTTP_V3_ERR_DECOMPRESSION_FAILED,
+                                          "too many blocked streams");
             return NGX_HTTP_V3_ERR_DECOMPRESSION_FAILED;
         }