Dear openvpn users,

we've been running an openVPN setup with, among others, android and
iOS clients, for several years now.

This involves the usual easy-rsa generated client certificate setup,
with an .ovpn file and .p12 key file distributed to our users.

Recently, this kind of breaks.

For Android, connections that were working before, timed out. A
reinstall of the .p12 file was able to make it work again.

Meanwhile, iOS clients (e.g. iOS 11.2.1, 11.2.2, openVPN app 1.2.5)
are no longer able to connect at all. The .p12 certificate looks
installed in the keystore, and can be reinstalled properly, but
selecting the certificate says "No certificates are present in the
Ke..."

The server side did not change at all, recently. We already tried
signing the keys with sha256 instead of md5, also tried with a freshly
created client key, all to no avail. See below for the client config
file we use (IPs and ca content redacted)

Basic question: is this a known issue, does it happen to others, too,
any idea how to get it to work again?

(chromeos and macOS clients, so far, keep working fine with the same setup)

best regards
  Patrick

proto udp
remote x.x.x.x 1194
remote y.y.y.y 1194
nobind

pull

tls-client
verify-x509-name server-ours name
ns-cert-type server

verb 3
daemon

cipher AES-256-CBC
comp-lzo

keepalive 5 15

<ca>
-----BEGIN CERTIFICATE-----
...
-----END CERTIFICATE-----
</ca>

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