I've upgraded my ASA 5512-X from ASA 9.6(2) to ASA 9.8.1.

After the upgrade Openconnect fails with following Error

SSL connection failure: A TLS fatal alert has been received

I didn't change any configuration. It also worked before.

Anybody knows, what could lead to this error?

  • 1
    In order for us to give you proper help, please consider posting the full configuration of your ASA. Remember to remove any public IP adresses, usernames and passwords.
    – user36472
    Aug 18, 2017 at 10:46
  • The software you have chosen is not safe harbor. It's recommended to always use safe harbor software. Did you upgrade the ASDM module as well?
    – user36472
    Aug 18, 2017 at 10:58
  • The Support told me to use this Software. I had a problem with the upgrade assistent and he said I should manually install this version. Yes. ASDM is v7.8.1. At the moment i don't have access to the config, but the config wasn't modifed. Aug 18, 2017 at 11:06
  • Well if you don't have access to the configuration it's hard to help. The SSL certificate could be expired after upgrading. It might need a renewal.
    – user36472
    Aug 18, 2017 at 11:12
  • It isn't. Checked that already. It is valid & trusted. This was also my first check. Also checked if it is possible to use TLS1.2. It is also. No I don't know. Aug 18, 2017 at 11:15

1 Answer 1


This was a bug in ASA 9.8.1. It is fixed in ASA 9.8.2 which is already available.

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