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USG9520 SSH login failure issue

Publication Date:  2014-09-24 Views:  116 Downloads:  0
Issue Description
When customer use SSH login Huawei Firewall USG9520, V200R001C01SPC700, the connection failed with below information :
An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full.
Alarm Information
An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full.
Handling Process
1. check ssh configuration 

#
undo ssh server compatible-ssh1x enable
stelnet server enable
ssh authentication-type default password
ssh user sshadmin
ssh user admin
ssh user sshadmin authentication-type password
ssh user admin authentication-type password
ssh user sshadmin service-type all
ssh user admin service-type all
ssh client first-time enable
ssh client 10.70.87.57 assign rsa-key 10.70.87.57
#

customer is using account "sshadmin" and "admin"  to test , the configuration is no problem.

2. advice customer to login  firewall with Putty or SecureCRT , please use the way of ssh2 because ssh server compatible-ssh1x has been disabled . But it's still not effective .

3. doubt it's probably caused by RSA key . advice customer to recreate RSA key , problem solved .
Root Cause
RSA key is invalid .
Solution
execute command “rsa local-key-pair creat 1024”, the problem solved. 
Suggestions
the issue of ssh failure is probably caused by two possible reasons : 

1. compatibility issue between ssh1 and ss2.
2. RSA key issue.

END