diff --git a/.gitignore b/.gitignore
index 6c643471..e8b1302d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,3 +20,5 @@ __pycache__
 *.mk
 util/src/main/resources/version.txt
 .gitconfig
+*/spx/*
+spx
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
index a22715df..c0ab91a6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -18,4 +18,4 @@ RUN npm install -g npm@6.9.0
 RUN npm install --global yarn@1.22.4
 RUN yarn --cwd /app/frontend/ install
 # RUN yarnpkg --cwd /app/frontend/ build
-RUN yarnpkg global add serve
\ No newline at end of file
+RUN yarnpkg global add serve@13.0.4
\ No newline at end of file
diff --git a/frontend/package.json b/frontend/package.json
index 1f657b53..4392d1dd 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -3,36 +3,36 @@
   "version": "0.1.0",
   "private": true,
   "dependencies": {
-    "@ant-design/icons": "^4.2.1",
-    "@testing-library/jest-dom": "^4.2.4",
-    "@testing-library/react": "^9.3.2",
-    "@testing-library/user-event": "^7.1.2",
-    "@types/history": "^4.7.6",
-    "@types/jest": "^24.0.0",
-    "@types/node": "^12.0.0",
-    "@types/react": "^16.9.0",
-    "@types/react-dom": "^16.9.0",
-    "@types/react-redux": "^7.1.9",
-    "@types/react-router-dom": "^5.1.5",
-    "@types/redux": "^3.6.0",
-    "@types/redux-thunk": "^2.1.0",
-    "antd": "^4.2.4",
-    "craco": "^0.0.3",
+    "@ant-design/icons": "~4.2.1",
+    "@testing-library/jest-dom": "~4.2.4",
+    "@testing-library/react": "~9.3.2",
+    "@testing-library/user-event": "~7.1.2",
+    "@types/history": "~4.7.6",
+    "@types/jest": "~24.0.0",
+    "@types/node": "~12.0.0",
+    "@types/react": "~16.9.0",
+    "@types/react-dom": "~16.9.0",
+    "@types/react-redux": "~7.1.9",
+    "@types/react-router-dom": "~5.1.5",
+    "@types/redux": "~3.6.0",
+    "@types/redux-thunk": "~2.1.0",
+    "antd": "~4.2.4",
+    "craco": "~0.0.3",
     "craco-less": "1.16",
-    "history": "^4.10.1",
-    "js-base64": "^2.5.2",
-    "lodash": "^4.17.19",
-    "map-keys-deep-lodash": "^1.2.2",
-    "prettier": "^2.0.5",
-    "react": "^16.13.1",
-    "react-dom": "^16.13.1",
-    "react-json-tree": "^0.11.2",
-    "react-redux": "^7.2.0",
-    "react-router-dom": "^5.2.0",
+    "history": "~4.10.1",
+    "js-base64": "~2.5.2",
+    "lodash": "~4.17.19",
+    "map-keys-deep-lodash": "~1.2.2",
+    "prettier": "~2.0.5",
+    "react": "~16.13.1",
+    "react-dom": "~16.13.1",
+    "react-json-tree": "~0.11.2",
+    "react-redux": "~7.2.0",
+    "react-router-dom": "~5.2.0",
     "react-scripts": "3.4.1",
-    "redux": "^4.0.5",
-    "redux-thunk": "^2.3.0",
-    "redux-thunk-recursion-detect": "^1.1.4",
+    "redux": "~4.0.5",
+    "redux-thunk": "~2.3.0",
+    "redux-thunk-recursion-detect": "~1.1.4",
     "typescript": "~3.7.2"
   },
   "scripts": {
@@ -60,6 +60,6 @@
     ]
   },
   "devDependencies": {
-    "eslint-config-airbnb-typescript-prettier": "^2.1.1"
+    "eslint-config-airbnb-typescript-prettier": "~2.1.1"
   }
 }
diff --git a/nexus/src/main/kotlin/tech/libeufin/nexus/ebics/EbicsClient.kt b/nexus/src/main/kotlin/tech/libeufin/nexus/ebics/EbicsClient.kt
index 65caf516..bbe01c1d 100644
--- a/nexus/src/main/kotlin/tech/libeufin/nexus/ebics/EbicsClient.kt
+++ b/nexus/src/main/kotlin/tech/libeufin/nexus/ebics/EbicsClient.kt
@@ -30,6 +30,9 @@ import org.slf4j.LoggerFactory
 import tech.libeufin.nexus.NexusError
 import tech.libeufin.util.*
 import java.util.*
+import java.io.File
+import java.time.LocalDateTime
+import java.time.format.DateTimeFormatter
 
 private val logger: Logger = LoggerFactory.getLogger("tech.libeufin.util")
 
@@ -66,6 +69,32 @@ class EbicsDownloadBankErrorResult(
     val returnCode: EbicsReturnCode
 ) : EbicsDownloadResult()
 
+
+fun writeResponseToFile(initResponseStr: String, transactionId: String) {
+    // Get base directory from environment variable TRACE_DIR
+    val baseDirectory = System.getenv("TRACE_DIR") ?: System.getProperty("user.dir")
+
+    // Check if directory "trace" exists, create it if not
+    val traceDirectory = File("$baseDirectory/trace")
+    if (!traceDirectory.exists()) {
+        traceDirectory.mkdirs()
+    }
+
+    // Get current date and time
+    val currentDateTime = LocalDateTime.now()
+    val formatter = DateTimeFormatter.ofPattern("yyyyMMdd_HHmmss")
+    val formattedDateTime = currentDateTime.format(formatter)
+
+    // Construct file name with transactionId and current date/time
+    val fileName = "${traceDirectory.absolutePath}/${transactionId}_$formattedDateTime.xml"
+
+    // Write response to file
+    val file = File(fileName)
+    file.writeText(initResponseStr)
+    println("Response written to file: $fileName")
+}
+
+
 /**
  * Do an EBICS download transaction.  This includes the initialization phase, transaction phase
  * and receipt phase.
@@ -110,6 +139,8 @@ suspend fun doEbicsDownloadTransaction(
             HttpStatusCode.InternalServerError,
             "initial response must contain transaction ID"
         )
+        
+    writeResponseToFile(transactionID,initResponseStr)
 
     val encryptionInfo = initResponse.dataEncryptionInfo
         ?: throw NexusError(HttpStatusCode.InternalServerError, "initial response did not contain encryption info")