Cattols 3.10 to FortiOS 5.2.5 or 5.4 doesn´t work

Hi,

since we upgraded to FortiOS 5.2.5 or 5.4 Cattools gives us the error message "Failed to connect to XXX. Reason: No respone from remote host. Will try again."

If we connect to it with Putty we get a session.

Have debugged the SSH from FortiOS but no error messages is shown.

The debug in Cattools doesn´t give any errors either:

<NEWSESSION CatTools 3.10.0 2016-01-15 08:41:31>

<PROTOCOL=SSH2>

<DEVICE TYPE=Fortinet.FortiOS.General>

<ACTIVITY TYPE=Device.Backup.Running Config>

<ACTIVITY SCRIPT=D:\Program Files (x86)\CatTools3\Scripts\Client.Device.Backup.Running Config.txt>

<USERS NAME FOR DEVICE=nbo-osd2fw01>

<D 13:48:31>

<SCRIPT VALUES>

<HOSTNAME="">

<PROMPT VTY="">

<PROMPT ENABLE="">

<PROMPT CONFIG="">

We have tried all different SSH ciphers but with the same result. When we save the ciphers we can see that it sends it to the FortiOS and that it accept it.

Any ideas?

Robin