We are going to switch to a new setup of proxies. The new proxies are more robust and secured than our current setup. The switch should be instant. It could happen that the new setup doesn't allow connections from old systems not up to date as the proxies only allow TLS 1.2 connections.
The following DNS are impacted:
If you notice issues connecting to https://customers.winbooks.be/portal, please check with www.ssllabs.com that your browser supports TLS 1.2. For older OSes, if you have issues with WinBooks Classic/Virtual Invoice to connect to the DEP, test the above url with Internet Explorer. Older OSes require to be updated/patched to use TLS 1.2.