OpenVPN Support Forum

Connection failure on IOS 17.1.1 and 16.7.2:
Getting the following message:
There was an error attempting to connect to the selected server.

Error message: You are using insecure hash algorithm in CA signature.
Please regenerate CA with other hash algorithm.

Retry or Cancel

Unable to find a solution in the forum

The client is complaining about insecure encryption options.
This happens when the server keys are kept in place for too long, so the involved encryption libraries no longer consider them secure.
The solution (plastered over multiple topics in this forum) is to update the server keys and ship new client configuration to users.