We have replaced the certificate of our FTP server to one which is signed by a public CA (previously it was signed by our own CA). Since then WinSCP moans that it does not trust the certificate any longer. While trying to track down the problem, we found that the point here is, that the client where WinSCP is running is disconnected from the internet. The difference with regards to our old certificate seems to be that the new certificate has a OSCP entry.
We also tried other FTP clients which also work if disconnected from the internet. However all clients seems to rely on the Windows certificate store, so there must be something different in the way this is handle within the application.
Is there any way to make WinSCP also work in disconnected environments with FTPS.
Thanks and best regards