Error using Sender SOAP adapter over HTTPS

Hi experts,

Few weeks ago, i developed an interface as follows: SOAP <-> XI <-> RFC.

I tested the functionality using Altova and everything went well, with HTTP.

However, when i use HTTPS it fails throwing these error messages (pop ups):

<i>"HTTP error: could not post file"......

"Error sending the soap data"</i>

I have reviewed the SSL certificates installation and everything seems to be ok, but currently i am stuck and do not know how to fix this.

I have also change the ID comm channel from HTTP to HTTPS with client aut.

Is there any special service i have to activate? (XI services and SPIGATE are already done)

Could you please assist?

Thanks in advance and best regards,

David