[JENKINS-68647] Jenkins Plugin ssh-agent could not ssh-add sucessfully a private key which is created as a jenkins credential ID

1. Create public and private keys.
   
   ssh-keygen -t ed25519 -C mymail@​mail.com
   
   got 2 files: id_ed25519, id_ed25519.pub

1. Add id_ed25519.pub to SSH Keys of git. 


2. Create a credential ID.
   
   


3. Use it for our Job and we could not visit git. 
   
   


4.  As a hint, when we use git 2.36.1, it shows Permission denied (publickey). But when we use git 2.21.0, it shows invalid format for private key. 

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Originally reported by fiann, imported from: Jenkins Plugin ssh-agent could not ssh-add sucessfully a private key which is created as a jenkins credential ID

• assignee: dnusbaum
  
• status: Open
  
• priority: Critical
  
• component(s): ssh-agent-plugin
  
• label(s): SSH, ssh-agent
  
• resolution: Unresolved
  
• votes: 0
  
• watchers: 1
  
• imported: 20260604-211335
  

Raw content of original issue

	
Create public and private keys.

ssh-keygen -t ed25519 -C mymail@mail.com

got 2 files: id_ed25519, id_ed25519.pub





	
Add id_ed25519.pub to SSH Keys of git. 

	
Create a credential ID.



	
Use it for our Job and we could not visit git. 



	
 As a hint, when we use git 2.36.1, it shows Permission denied (publickey). But when we use git 2.21.0, it shows invalid format for private key. 

• environment: Slave is windows 10. Private Key is ed25519.

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