diff --git a/resources/openxchange/oxa/connectiontestjob.cpp b/resources/openxchange/oxa/connectiontestjob.cpp
--- a/resources/openxchange/oxa/connectiontestjob.cpp
+++ b/resources/openxchange/oxa/connectiontestjob.cpp
@@ -36,9 +36,11 @@
     if (!mUrl.startsWith(QStringLiteral("https://"))) {
         mUrl = QStringLiteral("https://") + mUrl;
     }
-    const QUrl url(mUrl + QStringLiteral("/ajax/login?action=login&name=%1&password=%2").arg(mUser, mPassword));
+    const QUrl url(mUrl + QStringLiteral("/ajax/login?action=login&name=%1").arg(mUser));
 
-    KJob *job = KIO::storedGet(url, KIO::Reload, KIO::HideProgressInfo);
+    const QByteArray data = QStringLiteral("password=%1").arg(mPassword).toUtf8();
+    KIO::StoredTransferJob *job = KIO::storedHttpPost(data, url, KIO::HideProgressInfo);
+    job->addMetaData(QStringLiteral("content-type"), QStringLiteral("application/x-www-form-urlencoded"));
     connect(job, &KJob::result, this, &ConnectionTestJob::httpJobFinished);
 }