--- title: "DATEV URL: HTTPS and HTTP Configuration Guide" description: This guide explains how to avoid common mistakes with HTTP and HTTPS endpoints in DATEV. --- [Skip to content](https://knowledgebase.memtime.com/en/datev-authentication-error-https-and-http-configuration-guide#main-content) - [English](https://knowledgebase.memtime.com/en/datev-authentication-error-https-and-http-configuration-guide) - [Deutsch](https://knowledgebase.memtime.com/de/datev-authentifizierungsfehler-https-und-http-konfigurationsanleitung) English Show submenu for translations ![memtime-light-2x.png.png\]](https://knowledgebase.memtime.com/hs-fs/hubfs/memtime-light-2x.png.png?height=40&name=memtime-light-2x.png.png) Open main navigation Close main navigation - - [English](https://knowledgebase.memtime.com/en/datev-authentication-error-https-and-http-configuration-guide) - [Deutsch](https://knowledgebase.memtime.com/de/datev-authentifizierungsfehler-https-und-http-konfigurationsanleitung) English Show submenu for translations - [Go to memtime.com](https://www.memtime.com/) [Go to memtime.com](https://www.memtime.com/) Hi 🦥 How can we help you? - There are no suggestions because the search field is empty. 1. [Memtime Knowledge Base](https://knowledgebase.memtime.com/en?hsLang=en) 2. [🧩 Integrations](https://knowledgebase.memtime.com/en/integrations?hsLang=en) 3. [DATEV Integration](https://knowledgebase.memtime.com/en/integrations?hsLang=en#datev-integration) # DATEV URL: HTTPS and HTTP Configuration Guide ## This guide explains how to avoid common mistakes with HTTP and HTTPS endpoints in DATEV. If your Memtime app shows this error, you can follow the steps below: *"The HTTPS certificate is invalid.* *http://srv0000example:54852/datev/api/iam/v1/Users/me seems to be working.*  *You can use this URL instead." ![](https://knowledgebase.memtime.com/hs-fs/hubfs/image-png-Apr-17-2026-01-24-48-9189-PM.png?width=557&height=141&name=image-png-Apr-17-2026-01-24-48-9189-PM.png)* ### 1. For IT partner-controlled Terminal Servers (not DATEVasp) #### Use the correct URL format The most important rule: 1. **HTTPS always uses port 54852** 2. **HTTP always uses port 54854** Please do not mix them. #### Option 1: HTTPS (with "S") Use this format: ``` https://srv0000example:54852/datev/api/iam/v1/Users/me ``` #### ⚠️ HTTPS always uses port 54852. ⚠️ **Rules:** 1. Must start with "**https://**" - **with an "S"** 2. Must use port **54852** 3. If you use a different port, it will not work #### Option 2: HTTP (without "S") Use this format: ``` http://srv0000example:54854/datev/api/iam/v1/Users/me ``` #### ⚠️ HTTP  always uses port 54854. ⚠️ **Rules:** 1. Must start with "**http://**" - **without an "S"** 2. Must use port **54854** 3. If you use a different port, it will not work ### 2\. For DATEV-managed terminal servers (DATEVasp) If DATEV is hosted via a **DATEVasp server**, the address always remains: ``` http://localhost:58454 ``` #### ⚠️ HTTP  always uses port 54854. ⚠️ ### 3. Run the DATEV-API connection check If you are sure that you've used the correct URL, and that the endpoints you used in it are also correct, please make sure to do the following DATEV-API Connection Check: 🔗 [DATEV API Connection Check](https://knowledgebase.memtime.com/en/datev-api-verbindungspr%C3%BCfung) ### 4\. Still not working? If, after completing all of the above steps, the Memtime app still displays an error message, please reach out to us at **support@memtime.com** and include the following: 1. A screenshot of the error message in Memtime ![](https://knowledgebase.memtime.com/hubfs/image-png-Apr-17-2026-01-25-07-7901-PM.png) 2. A screenshot of the Connection Check as shown below: ![DATEV API Check-png](https://knowledgebase.memtime.com/hs-fs/hubfs/DATEV%20API%20Check-png.webp?width=670&height=522&name=DATEV%20API%20Check-png.webp)   - [🚀 Getting started](https://knowledgebase.memtime.com/en/getting-started?hsLang=en) - [🧠 Memory Aid](https://knowledgebase.memtime.com/en/memory-aid?hsLang=en) - [📁 Memtime Projects](https://knowledgebase.memtime.com/en/memtime-projects?hsLang=en) - [⏳ Time entries](https://knowledgebase.memtime.com/en/time-entries?hsLang=en) - [👥 Customer Portal](https://knowledgebase.memtime.com/en/customer-portal?hsLang=en#main-content) - [Managing Users](https://knowledgebase.memtime.com/en/customer-portal?hsLang=en#managing-users) - [Purchasing Memtime](https://knowledgebase.memtime.com/en/customer-portal?hsLang=en#purchasing-memtime) - [Account Management](https://knowledgebase.memtime.com/en/customer-portal?hsLang=en#account-management) - [📉 Reports & Statistics](https://knowledgebase.memtime.com/en/reports-statistics?hsLang=en) - [🧩 Integrations](https://knowledgebase.memtime.com/en/integrations?hsLang=en#main-content) - [Calendar Integrations](https://knowledgebase.memtime.com/en/integrations?hsLang=en#calendar-integrations) - [DATEV Integration](https://knowledgebase.memtime.com/en/integrations?hsLang=en#datev-integration) - [Project Management](https://knowledgebase.memtime.com/en/integrations?hsLang=en#project-management) - [Telephone Integrations](https://knowledgebase.memtime.com/en/integrations?hsLang=en#telephone-integrations) - [🖥️ Guides for Admins](https://knowledgebase.memtime.com/en/%EF%B8%8F-guides-for-admins?hsLang=en) - [🛠️ Troubleshooting](https://knowledgebase.memtime.com/en/%EF%B8%8F-troubleshooting?hsLang=en#main-content) - [Microsoft Windows](https://knowledgebase.memtime.com/en/%EF%B8%8F-troubleshooting?hsLang=en#microsoft-windows) - [macOS](https://knowledgebase.memtime.com/en/%EF%B8%8F-troubleshooting?hsLang=en#macos) - [Linux](https://knowledgebase.memtime.com/en/%EF%B8%8F-troubleshooting?hsLang=en#linux) - [Integrations](https://knowledgebase.memtime.com/en/%EF%B8%8F-troubleshooting?hsLang=en#integrations) [![Chill listening crop-3](https://knowledgebase.memtime.com/hs-fs/hubfs/memtime-light-2x.png.png?width=133&height=24&name=memtime-light-2x.png.png "Chill listening crop-3")](http://www.memtime.com) Knowledge Base Copyright © 2026, Memtime GmbH