diff --git a/UpdatePTUDevCtrl/main.cpp b/UpdatePTUDevCtrl/main.cpp
index a809445..8487f26 100644
--- a/UpdatePTUDevCtrl/main.cpp
+++ b/UpdatePTUDevCtrl/main.cpp
@@ -50,9 +50,11 @@
 // argv[1]: file to send to dc
 int main(int argc, char *argv[]) {
     QByteArray const value = qgetenv("LC_ALL");
-    if (value != "C") {
+    if (value.isEmpty() || value != "C") {
         qputenv("LC_ALL", "C");
     }
+
+
     // qputenv("XDG_RUNTIME_DIR", "/var/run/user/0");
 
     openlog("ATB-UPDATE", LOG_PERROR | LOG_PID | LOG_CONS, LOG_USER);
@@ -72,6 +74,33 @@ int main(int argc, char *argv[]) {
     parser.readSettings();
 
     QString repositoryUrl = parser.repositoryUrl();
+    QString gitSSHCommand("");
+
+    if (repositoryUrl.contains("ptu-config.atb-comm.de")) {
+        QByteArray const v = qgetenv("GIT_SSH_COMMAND");
+        if (v.isEmpty()) {
+            QString sshKeyFile("/opt/app/tools/atbupdate/.keys/id_ed25519_ptuConfig");
+            if (QFileInfo(sshKeyFile).exists()) {
+                gitSSHCommand = "ssh -i /opt/app/tools/atbupdate/.keys/id_ed25519_ptuConfig";
+                if (!qputenv("GIT_SSH_COMMAND", QByteArray(gitSSHCommand.toStdString().c_str()))) {
+                    qCritical() << "ERROR: GIT_SSH_COMMAND not put into env. Exiting...";
+                    return -1;
+                }
+            } else {
+                qCritical() << "ERROR ssh-key-file" << sshKeyFile << "does not exists. Exiting...";
+                return -1;
+            }
+        } else {
+            gitSSHCommand = QString(v.toStdString().c_str());
+            qCritical() << "WARNING GIT_SSH_COMMAND already set in enviroment:"
+                        << gitSSHCommand;
+            if (gitSSHCommand != "ssh -i /opt/app/tools/atbupdate/.keys/id_ed25519_ptuConfig") {
+                qCritical() << "ERROR" << gitSSHCommand << "wrong. Exiting...";
+                return -1;
+            }
+        }
+    }
+
     QString plugInDir = parser.plugInDir();
     QString plugInName = parser.plugInName();
     QString workingDir = parser.workingDir();
@@ -94,6 +123,9 @@ int main(int argc, char *argv[]) {
 
     qInfo() << "pwd ......................" << rtPath;
     qInfo() << "repositoryUrl ............" << repositoryUrl;
+    if (!gitSSHCommand.isEmpty()) {
+        qInfo() << "GIT_SSH_COMMAND .........." << gitSSHCommand;
+    }
     qInfo() << "plugInDir ................" << plugInDir;
     qInfo() << "plugInName ..............." << plugInName;
     qInfo() << "workingDir ..............." << workingDir;