Nessus Output:

Description
The remote host allows SSL/TLS connections with one or more Diffie-Hellman moduli less than or equal to 1024 bits. 
Through cryptanalysis, a third party may be able to find the shared secret in a short amount of time (depending on modulus size and attacker resources). 
This may allow an attacker to recover the plaintext or potentially violate the integrity of connections.

Solution
Reconfigure the service to use a unique Diffie-Hellman moduli of 2048 bits or greater.

Fix:

• Configure the ‘SSL Cipher Suite Order’ Group Policy Setting

References:

• Weak Diffie-Hellman and the Logjam Attack
• Diffe-Hellman 2048bit support
• Hardening SSL & TLS connections on Windows Server 2008 R2 & 2012 R2