Disable old (unsecure) IIS protocols It is highly recommended to disable old protocols like TLS 1.0 TLS 1.1 3DES How to do this Download IIS Crypto developed by Nartac Software :  https://www.nartac.com/Products/IISCrypto Start IIS Crypto as Administrator Disable everything, and then enable the following items: Press Apply Restart the PC (best practice) or restart IIS. TIP: check your MXSuite website via the Site Scanner option