Client VPN doesn't work suddently

1

I have a client VPN endpoint in ap-southeast-1 region. I was able to connect to the VPN using OpenVPN Connect on 29 Nov 2022. But now I cannot connect any more. No configuration changes to the VPN endpoint. The ssl cert is still valid. OpenVPN only shows timeout. What could go wrong? Any hint is appreciated.

posta un anno fa983 visualizzazioni
2 Risposte
1

It would be good, if you could have posted the actuall error. I assume that you might have mutual authentication . Please refer to the below articles for troubleshooting.

https://docs.aws.amazon.com/vpn/latest/clientvpn-admin/troubleshooting.html

https://docs.aws.amazon.com/vpn/latest/clientvpn-user/common-troubleshooting.html

If you still face issues, please post with more logs .

AWS
con risposta un anno fa
  • Here's the snippet of the OpenVPN Connect log. Seems the DNS server was resolved but the ssl handshake failed.

    Connecting to [ascfd.cvpn-endpoint-xxxxxxxxxxxx.prod.clientvpn.ap-southeast-1.amazonaws.com]:443 (xx.xxx.xxx.xxx) via UDPv4 EVENT: CONNECTING Tunnel Options:V4,dev-type tun,link-mtu 1521,tun-mtu 1500,proto UDPv4,cipher AES-256-GCM,auth [null-digest],keysize 256,key-method 2,tls-client ... Session invalidated: KEEPALIVE_TIMEOUT Client terminated, restarting in..

  • I re-created a new server certificate and a few client certificates. Still doesn't work.

  • Im facing a similar issue, everything worked great, no changes were made at all, I can connect but now nothing resolves. I cannot get online or hit internal resources.

1

The culprit is the client certificate revocation list (crl), which expired on 30 Nov 2022. The resolution is to generate a new crl and upload to the client vpn endpoint.

con risposta un anno fa
  • I had the same issue, and solved it based on @blacktulip11's comment. You can check crl expiration via:

    openssl crl -in file.crl -text

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