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AnyConnect new feature - DTLSv1.2

With the release of v9.10.1, has anyone been able to get DTLSv1.2 working with AnyConnect sessions? (Our clients are v4.6.02074)

-If I don't specify dtlsv1.2, it will always establish the DTLS tunnel using dtlsv1.0.

-If I do specify dtlsv1.2 with the following config, the DTLS tunnel fails to establish with the message "%ASA-5-722043: Group <groupid> User <userid> IP <ipaddress> DTLS disabled: unable to negotiate cipher".   Removing the "ssl cipher dtlsv1" line makes no difference.


ssl server-version tlsv1.2 dtlsv1.2

ssl cipher default custom "ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384"

ssl cipher dtlsv1 custom "AES256-SHA"

ssl cipher tlsv1.2 custom "ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384"

ssl cipher dtlsv1.2 custom "ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384"

ssl ecdh-group group20

ssl dh-group group24

35 Replies 35

Thanks, Marvin:

I have just upgrade my ASA to the latest interim release and AnyConnect client 4.7.00136. It comes up with  DTLSv1.2 and it can be seen in both ASA and Client GUI interface:


Tunnel ID : 8.3
Assigned IP : Public IP :
Encryption : AES-GCM-256 Hashing : SHA384
Ciphersuite : AES256-GCM-SHA384
Encapsulation: DTLSv1.2 UDP Src Port : 56925


My tunnels are negotiating properly also. dtlsv1.2 is up and running.


I updated my just now:

ASA 9.12(4)

ASDM 7.13(1.101)

AnyConnectClient (4.903049)

but I still see only DTLDv1.0? Could you please tell me, what you configured on your asa?

Many thx in advance
 please share the output of "show run ssl" from your ASA. It should match what the original poster has mentioned above.

Hi Marvin,


thx, do am I right, I have to configure these on CLI and not with the ASDM. I only find a box to tag or untag DTLD support?



You can make the changes in ASDM. See the following example:

ASDM Custom SSL SettingsASDM Custom SSL Settings



after doing it in ASDM I've got this message:

Bildschirmfoto 2021-02-04 um 13.36.50.png

ciscoasa# sh run ssl
ssl client-version tlsv1.2
ssl dh-group group24
ssl ecdh-group group20
ssl trust-point ASDM_Launcher_Access_TrustPoint_0 outside
ssl trust-point ASDM_Launcher_Access_TrustPoint_0 inside3
ssl trust-point ASDM_Launcher_Access_TrustPoint_0 backup
ssl trust-point ASDM_Launcher_Access_TrustPoint_0 inside3 vpnlb-ip


Any ideas? Thx in advancd please share the output of "show version" so we can confirm the necessary 3DES-AES licenses.



ciscoasa# sh version

Cisco Adaptive Security Appliance Software Version 9.12(4)
SSP Operating System Version 2.6(1.198)
Device Manager Version 7.13(1)

Compiled on Thu 21-May-20 11:17 PDT by builders
System image file is "disk0:/asa9-12-4-lfbff-k8.SPA"
Config file at boot was "startup-config"

ciscoasa up 1 min 19 secs

Hardware: ASA5506, 4096 MB RAM, CPU Atom C2000 series 1250 MHz, 1 CPU (4 cores)
Internal ATA Compact Flash, 8000MB
BIOS Flash M25P64 @ 0xfed01000, 16384KB

Encryption hardware device : Cisco ASA Crypto on-board accelerator (revision 0x1)
Number of accelerators: 1

1: Ext: GigabitEthernet1/1 : address is 7488.bb56.3244, irq 255
2: Ext: GigabitEthernet1/2 : address is 7488.bb56.3245, irq 255
3: Ext: GigabitEthernet1/3 : address is 7488.bb56.3246, irq 255
14: Int: Internal-Data1/4 : address is 0000.0100.0001, irq 0
The Running Activation Key feature: 2 security contexts exceed the limit on the platform, reduced to 0 security contexts.

Licensed features for this platform:
Maximum Physical Interfaces : Unlimited perpetual
Maximum VLANs : 5 perpetual
Inside Hosts : Unlimited perpetual
Failover : Disabled perpetual
Encryption-DES : Enabled perpetual
Encryption-3DES-AES : Enabled perpetual
Carrier : Disabled perpetual
AnyConnect Premium Peers : 2 perpetual
AnyConnect Essentials : Disabled perpetual
Other VPN Peers : 10 perpetual
Total VPN Peers : 12 perpetual
AnyConnect for Mobile : Disabled perpetual
AnyConnect for Cisco VPN Phone : Disabled perpetual
Advanced Endpoint Assessment : Disabled perpetual
Shared License : Disabled perpetual
Total TLS Proxy Sessions : 2 perpetual
Botnet Traffic Filter : Disabled perpetual
Cluster : Disabled perpetual

This platform has a Base license.

Serial Number: xxxxxxxxxxxxxxxxxx
Running Permanent Activation Key: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Configuration register is 0x1
FPGA UPGRADE Version : 3.0
FPGA GOLDEN Version : 3.0
ROMMON Version : 1.1.15
Image type : Release
Key Version : A
Configuration has not been modified since last system restart.


I think this should not the problem .... 


After using more and more ASDM I had to another problem. After configuring v1.2 I couldn't dial in, so I tried to do a full restore. The restore works til 55% showing loading *.pkg file than nothing happens. After I interrupted it, it seems to work, but my AbyConnect client show a profile cisco asa (IPSEC) IPv4 and shows the message cryptographic algorythmen fails ..... If I interrupt this using my outside ip it works.

I never configured a profile asa (IPSEC) IPv4. I don't see this in the xml.files I found. Where I can delete it?

Is there a asa /asdm version combi you works well. I re, that sometimes ASDM do strange things depending on the version?

My thx in advance


The recommended releases for an ASA 5506 are currently 9.14(2)8, 9.12(4)10 or 9.8(4)32. All with ASDM 7.15(1).

However none of those should affect your ability to run TLS 1.2 and DTLS 1.2 with customer ciphers. I have it setup fine on my ASA 5506 running 9.10.

You don't have a Firepower service module do you? ASA 5506-X doesn't support those from ASA 9.10 or later.

Hi Marvin,


I updated all on the recommend SW. My 5506-x doesn't have a sfr modules:


ciscoasa# sh module

Mod Card Type Model Serial No.
---- -------------------------------------------- ------------------ -----------
1 ASA 5506-X with SW, 8GE Data, 1GE Mgmt, AC ASA5506 xxxxxxxxxxxxx
sfr Unsupported Unsupported

Mod MAC Address Range Hw Version Fw Version Sw Version
---- --------------------------------- ------------ ------------ ---------------
1 7488.bb56.3243 to 7488.bb56.324c 2.3 1.1.15 9.12(4)10

Mod SSM Application Name Status SSM Application Version
---- ------------------------------ ---------------- --------------------------

Mod Status Data Plane Status Compatibility
---- ------------------ --------------------- -------------
1 Up Sys Not Applicable



So would it be possible to show me your running config, so I can compared with my config?


Thx in advance


how did you get this working?  i currently have 4.7 anyconnect that the clients connect to an ASA with 9.8 and I don't even the options to configure dtlvs1.2.

@Amafsha1DTLS v1.2 was introduced in ASA v9.10, you will need to upgrade.

Thank you

is it possible to go from 9.8 directly to 9.12 in 1 upgrade?  

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