diff --git a/.github/workflows/common-performance.yml b/.github/workflows/common-performance.yml
index b6749366..b48b575c 100644
--- a/.github/workflows/common-performance.yml
+++ b/.github/workflows/common-performance.yml
@@ -112,8 +112,8 @@ jobs:
         if: ${{ inputs.ignore_caches || steps.cache-build.outputs.cache-hit != 'true' }}
         shell: powershell
         run: |
-          New-Item -Path . -Name "build" -ItemType "directory" -Force
-          New-Item -Path . -Name "build/config" -ItemType "directory" -Force
+          New-Item -Path . -Name "build" -ItemType "directory" -Force | Out-Null
+          New-Item -Path . -Name "build/config" -ItemType "directory" -Force | Out-Null
           $config = Get-Content -Path ./docker/client-env/qpep.yml.tpl
           $config = $config.replace('<QPEP_GATEWAY>','${{ inputs.server_public_address }}')
           $config = $config.replace('<QPEP_ADDRESS>','${{ inputs.client_listen_address }}')
diff --git a/backend/backend_quicgo.go b/backend/backend_quicgo.go
index 45c2a6ef..1be99da3 100644
--- a/backend/backend_quicgo.go
+++ b/backend/backend_quicgo.go
@@ -233,6 +233,7 @@ func loadTLSConfig(certPEM, keyPEM string) *tls.Config {
 	dataKey, err2 := ioutil.ReadFile(keyPEM)
 
 	if err1 != nil {
+		logger.Error("Could not find certificate file %s", certPEM)
 		return nil
 	}
 
@@ -252,11 +253,13 @@ func loadTLSConfig(certPEM, keyPEM string) *tls.Config {
 	}
 
 	if len(cert.Certificate) == 0 {
+		logger.Error("Certificate file %s does not contain valid certificates", certPEM)
 		return nil
 	}
 
 	x509Cert, err := x509.ParseCertificate(cert.Certificate[0])
 	if err != nil {
+		logger.Error("Certificate parsing in file %s failed: %v", certPEM, err)
 		return nil
 	}
 
@@ -268,9 +271,11 @@ func loadTLSConfig(certPEM, keyPEM string) *tls.Config {
 		for {
 			keyDERBlock, dataKey = pem.Decode(dataKey)
 			if keyDERBlock == nil {
+				logger.Error("Certificate key parsing in file %s failed", dataKey)
 				return nil
 			}
 			if keyDERBlock.Type == "PRIVATE KEY" || strings.HasSuffix(keyDERBlock.Type, " PRIVATE KEY") {
+				logger.Error("Certificate PEM key parsing in file %s failed", dataKey)
 				break
 			}
 			skippedBlockTypes = append(skippedBlockTypes, keyDERBlock.Type)
@@ -278,6 +283,7 @@ func loadTLSConfig(certPEM, keyPEM string) *tls.Config {
 
 		cert.PrivateKey, err = parsePrivateKey(keyDERBlock.Bytes)
 		if err != nil {
+			logger.Error("Error loading private key from file %s: %v", dataKey, err)
 			return nil
 		}
 
@@ -285,28 +291,35 @@ func loadTLSConfig(certPEM, keyPEM string) *tls.Config {
 		case *rsa.PublicKey:
 			priv, ok := cert.PrivateKey.(*rsa.PrivateKey)
 			if !ok {
+				logger.Error("Error loading private key from file %s: Not a valid RSA key", dataKey)
 				return nil
 			}
 			if pub.N.Cmp(priv.N) != 0 {
+				logger.Error("Error loading private key from file %s: internal error", dataKey, err)
 				return nil
 			}
 		case *ecdsa.PublicKey:
 			priv, ok := cert.PrivateKey.(*ecdsa.PrivateKey)
 			if !ok {
+				logger.Error("Error loading private key from file %s: Not a valid ECDSA key", dataKey, err)
 				return nil
 			}
 			if pub.X.Cmp(priv.X) != 0 || pub.Y.Cmp(priv.Y) != 0 {
+				logger.Error("Error loading private key from file %s: internal error", dataKey, err)
 				return nil
 			}
 		case ed25519.PublicKey:
 			priv, ok := cert.PrivateKey.(ed25519.PrivateKey)
 			if !ok {
+				logger.Error("Error loading private key from file %s: Not a valida ED25519 key", dataKey, err)
 				return nil
 			}
 			if !bytes.Equal(priv.Public().(ed25519.PublicKey), pub) {
+				logger.Error("Error loading private key from file %s: internal error", dataKey, err)
 				return nil
 			}
 		default:
+			logger.Error("Error loading private key from file %s: unsupported key type %v", dataKey, pub)
 			return nil
 		}
 	}
diff --git a/docker/build-linux/docker-compose.yml b/docker/build-linux/docker-compose.yml
deleted file mode 100644
index 7fa2a134..00000000
--- a/docker/build-linux/docker-compose.yml
+++ /dev/null
@@ -1,13 +0,0 @@
-version: "3"
-
-services:
-  linux-build:
-    image: project-faster/qpep_linux
-    build:
-      context: .
-    environment:
-      - QPEP_REPO=https://github.com/Project-Faster/qpep.git
-      - QPEP_BRANCH=issue-22-performance-testing
-      - QPEP_REV=HEAD
-    volumes:
-      - ./build:/build