diff --git a/src/transport_layer/pkt_normalizer.c b/src/transport_layer/pkt_normalizer.c
index fcc3a9c4..ac777d95 100644
--- a/src/transport_layer/pkt_normalizer.c
+++ b/src/transport_layer/pkt_normalizer.c
@@ -357,7 +357,10 @@ static void pn_unpacker_cb(struct ll_queue* q, void* arg) {
                 uint16_t size = payload[ptr] | (payload[ptr + 1] << 8);
                 if (!size || size > PKTNORM_MAX_DGRAM_SIZE) {
                     pn->logic_errors++;
-                    DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "[%s] invalid normalizer size=%u seq=%u", conn->log_name, size, frag->seq);
+                    DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "[%s] invalid normalizer size=%u seq=%u offset=%u fragment_len=%u "
+                        "reset=%u epochs=%016llx/%016llx", conn->log_name, size, frag->seq, ptr, len, conn->reset_count,
+                        (unsigned long long)conn->reset_id, (unsigned long long)conn->peer_reset_id);
+                    log_dump(DEBUG_LEVEL_ERROR, DEBUG_CATEGORY_ETCP, "Invalid normalizer fragment", payload, len < 64 ? len : 64);
                     etcp_conn_fatal_reinit(conn, "bad fragment size"); break;
                 }
                 pn->recvpart = ll_alloc_lldgram(size);