[asterisk-users] Let's encrypt privkey : Specified certificate file could not be used

[Daniel Tryba]

On Fri, Jun 02, 2017 at 02:36:38PM +0200, Jonas Kellens wrote:
> [Jun  2 14:29:28]   == DTLS ECDH initialized (secp256r1), faster PFS enabled
> [Jun  2 14:29:28] ERROR[27360][C-00000ae5]: res_rtp_asterisk.c:1441
> ast_rtp_dtls_set_configuration: Specified certificate file
> '/etc/letsencrypt/live/ws.mydomain.tld/privkey.pem' for RTP instance
> '0x7f920c538a78' could not be used

What size is the privatekey? There is a script to create cert for
asterisk:
https://github.com/asterisk/asterisk/blob/master/contrib/scripts/ast_tls_cert
It create a 1024b keypair, maybe for a good reason. Certbot its size is
2048 by default. Try adding --rsa-key-size 1024 (our signing a
"handcrafted" key)