diff --git a/upload-processor/BulkFileUploadFunctionApp/Services/IBulkUploadSvcBusClient.cs b/upload-processor/BulkFileUploadFunctionApp/Services/IBulkUploadSvcBusClient.cs
index b4a7bb0ff..b2e260d75 100644
--- a/upload-processor/BulkFileUploadFunctionApp/Services/IBulkUploadSvcBusClient.cs
+++ b/upload-processor/BulkFileUploadFunctionApp/Services/IBulkUploadSvcBusClient.cs
@@ -34,7 +34,7 @@ public BulkUploadSvcBusClient(IEnvironmentVariableProvider environmentVariablePr
             _logger = logger;
             _svcBusClient = new ServiceBusClient(_serviceBusConnectionString, new ServiceBusClientOptions
             {
-                TransportType = ServiceBusTransportType.AmqpTcp,
+                TransportType = ServiceBusTransportType.AmqpWebSockets, // Use port 443.
                 RetryOptions = new ServiceBusRetryOptions
                 {
                     TryTimeout = TimeSpan.FromSeconds(60),