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ASA-CUMA proxy - MMP unsupported header

Hi guys,

we've run into a strange problem regarding the communication between the mobile clients and the CUMA server.

On the ASA which is acting as a TLS proxy we got this message:

...

TLSP c9a5bf30: ==> Proxy Tx 58 bytes
TLSP c9a5bf30: Started SSL handshake with Server
TLSP c9a5bf30: Data channel ready for the Client
TLSP c9a5bf30: <-- Proxy Rx 689 bytes
TLSP c9a5bf30: ==> Proxy Tx 198 bytes
TLSP c9a5bf30: --> Proxy Rx 437 bytes
TLSP c9a5bf30: --> Rx #1 bp c5864ee0 bytes 406
TLSP c9a5bf30: --> Rx #1 sd ca4662d0, start_limit c5865280, end c5865416, bytes 406

MMP:: received 406 bytes from outside:1.1.1.1/1383 to inside:10.10.10.10./5443
MMP:: unsupported header
MMP:: error=-1 from outside:1.1.1.1/1383 to inside:10.10.10.10/5443
TLSP c9a5bf30: Inspect action returned code 3
TLSP c9a5bf30: Tear down proxy for Client outside:1.1.1.1/1383.
TLSP c9a5bf30: Tear down proxy for Server inside:10.10.10.10/5443.
TLSP c9a5bf30: Lic released

When a client tries to connect to the server, the certificate is checked and then the session just hangs (terminated).

Does anybody have any ideas?

Thanks.

Regards

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