ADSL RSA host key retrieval failed

We have a Cisco ADSL and I was wondering why this error is getting logged.
"Fail to establish SSH session because RSA host key retrieval failed."

Our clients are remote VPN clients and they are getting disconnected from the network intermittently.  Should this be a security concern?
Thanks in Advance
GetRdoneAsked:
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Alan Huseyin KayahanCommented:
Hello GetRdone,
     Is this a recent issue you encounter? Is this an SSH issue or VPN issue? Please elaborate more

Deleting existing keys and regenerating may help. Also make sure hostname of router and domain-name is set.
crypto key zeroize rsa
crypto key generate rsa general-keys modulus 1024

Regards
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GetRdoneAuthor Commented:
Guru,
It is a recent issue.  The VPN is disconnecting the remote client pc's XPPro.
Thanks in Advance
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Alan Huseyin KayahanCommented:
Where do you see that error? Did you try executing above commands?
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