Technical Tip: FortiAPs unable to join FortiGate after FortiOS 7.0 upgrade

Description
Legacy FortiAPs are not able to join FortiGate after upgrade to 7.0.

This article describes how to process.

Solution
FortiOS 7.0.0 has reinforced strong cryptographic ciphers.
As a result, legacy FortiAP models using weak ciphers are blocked by default from connecting with FortiGates running FortiOS 7.0.0.

It is possible to disable  strong cryptographic ciphers using given commands.

# config system global
    set ssl-static-key-ciphers enable
    set strong-crypto disable
end