Difference between revisions of "Openssh client: Invalid key length"

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Error message from [[Openssh]] client when connecting to a [[Cisco]] router/switch:
 
 
Message when connecting to a Cisco router:
 
 
   [[ssh_dispatch_run_fatal]]: Connection to 10.10.10.4 port 22: [[Invalid key length]]
 
   [[ssh_dispatch_run_fatal]]: Connection to 10.10.10.4 port 22: [[Invalid key length]]
Solution:
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Solution, execute in [[Cisco IOS]]:
  * <code>[[Crypto key zeroize rsa‎‎]]</code>
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  [[crypto key zeroize rsa‎‎]]
 
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[[crypto key generate rsa modulus 2048]]
  
  
  
[[OpenSSH 7.6]] (2017)
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[[OpenSSH 7.6]] (October 2017)
* Refuse [[keys]] <1024 bits in length and improve reporting for keys that do not meet this requirement.
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* Refuse [[keys length]] <1024 bits in length and improve reporting for keys that do not meet this requirement.
  
  
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[[Category:ssh]]
 
[[Category:ssh]]
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[[Category:IOS]]

Latest revision as of 06:12, 18 September 2021

Error message from Openssh client when connecting to a Cisco router/switch:

 ssh_dispatch_run_fatal: Connection to 10.10.10.4 port 22: Invalid key length

Solution, execute in Cisco IOS:

crypto key zeroize rsa‎‎
crypto key generate rsa modulus 2048


OpenSSH 7.6 (October 2017)

  • Refuse keys length <1024 bits in length and improve reporting for keys that do not meet this requirement.


Related terms[edit]

See also[edit]

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