FreeRadius 3.0.17 - TLS issue

Alan DeKok aland at
Wed Nov 28 12:48:50 CET 2018

On Nov 27, 2018, at 12:37 PM, Thorsten Fritsch <thorsten.fritsch at> wrote:
> we're running FR 3.0.17 and currently have some trouble with Windows 10 Clients which since just recently no longer can
> connect to the PEAP/MS-CHAPv2-based eduroam network.
> According to the radius debug log the FR server sends an Access Accept to the NAS (Cisco WLC) but it then terminates
> with the information: ERROR: eap_peap: TLS Alert write:fatal:protocol version

  Likely due to TLS 1.2.

> 53282519) Tue Nov 27 16:07:35 2018: Debug: Sent Access-Accept Id 251 from to length 0
> (53282519) Tue Nov 27 16:07:35 2018: Debug:   Tunnel-Type = VLAN

  Don't sent "radiusd -Xx" please... all of the documentation says to just use "radiusd -X".

> It looks like a TLS mismtach but not sure. Any experiences with this ? Which TLS versions are supported by FR 3.0.17 ?

  FreeRADIUS uses OpenSSL for TLS.  So check your OpenSSL library.

  Odds are that you're running a version / OS which is a few years old, and doesn't support TLS 1.2.  You'll have to upgrade to a recent release of OpenSSL in order to fix that.

  Which likely means upgrading the entire OS, as OpenSSL is used by many applications.

  Alan DeKok.

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