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Cisco Bug: CSCtd89026 - SecureCRT 4.09 fails to connect, post CSCin90961

Last Modified

Feb 16, 2018

Products (1)

  • Cisco IOS

Known Affected Releases


Description (partial)

Client connections initiated from SecureCRT 4.09 to IOS SSH servers running SSH version 2 are failing due to invalid modulus value presented by client

The issue has been duplicated on 12.4(24)T1 and 15.0(1)XA and appears to be happening in all IOS releases greater than 12.4(15)T9.  The issue happens when running SecureCRT as the client and SSH version 2 on the IOS server.

SSH Debugs in IOS show the following message:
Dec  3 10:55:22.494 EST: SSH2 0: Range sent by client is - 1024 < 2046 <2046
Dec  3 10:55:22.494 EST: SSH2 0:  Invalid modulus length
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