eFOBsync network access: addresses, ports, and proxy
Network connections
The table below lists connections made by eFOBsync and browser connections used for setup, support, and downloading updates. eFOBsync or the user's browser initiates each connection to the listed service. You do not need to open inbound Internet ports on the computer running eFOBsync.
| Service or FQDN | Port and protocol | Description | Required for synchronization |
|---|---|---|---|
api.efob.app | TCP 443, HTTPS | eFOB API: eFOBsync sign-in, configuration retrieval, synchronization requests, and status updates. | Yes |
| Data storage address | TCP 443, HTTPS | eFOBsync sends data to the data storage using an address received from the API. Confirm the current address with eFOB support. | Yes |
| Connection to the HR system or its database | Depends on the connection configuration | eFOBsync access to the data source in the HR and payroll system. | Yes, according to the configured data source |
efob.app | TCP 443, HTTPS | Access to the eFOB platform in a browser, for example, when configuring a data flow. | No |
www.efob.pl | TCP 443, HTTPS | Browser downloads of the installer and updates. | No |
docs.efob.app | TCP 443, HTTPS | The Help Center opened from the application in a browser. | No |
| Diagnostic-event reporting | TCP 443, HTTPS | This connection can be blocked without affecting synchronization. | No |
Proxy
eFOBsync does not have its own field for entering a proxy address. Its HTTP requests use the .NET default proxy configuration. On Windows, .NET reads proxy environment variables or, if they are not set, the user's proxy settings. Supported variables include HTTPS_PROXY, HTTP_PROXY, ALL_PROXY, and NO_PROXY. See the .NET documentation for details.
The .NET default proxy configuration applies to both eFOB API connections and uploads to Azure Blob Storage. The proxy must allow HTTPS connections to both services and PUT requests to the storage endpoint. Exceptions set in NO_PROXY can cause requests to the specified hosts to bypass the proxy.
Contact eFOB support to configure the proxy connection. Settings apply to the Windows account running eFOBsync. After setup, verify sign-in and a full synchronization on that account, including the storage upload. A proxy does not replace access rules for the local database.