Can't update WPMU plugins because of Forbidden WPMU DEV POST

Hello,

I have a 403 Forbidden error when I launch an Update.

Here is some info about my server :

Address 178.33.103.24

Remote HTTP Requests
- WPMU DEV: GET Forbidden
- WPMU DEV: POST Forbidden
- PayPal API: POST OK

Could you whitelist my IP on your system ?

Regards,
Didier