Steps to disable the diffie-hellman-group1-sha1 algorithm in SSH

Solution Verified - Updated -


  • Vulnerability scanner detected one of the following in a RHEL-based system:

    Deprecated SSH Cryptographic Settings
    key exchange    diffie-hellman-group1-sha1
    Disable weak Key Exchange Algorithms
  • How to disable the diffie-hellman-group1-sha1 Key Exchange Algorithm used in SSH?


  • Red Hat Enterprise Linux (RHEL) 6, 7, 8 and 9

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Using a Red Hat product through a public cloud?

How to access this content