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can't login NE40E by SSH

Publication Date:  2014-12-31 Views:  35 Downloads:  0
Issue Description
【Problem Summary】JED1-RR(10.220.0.2) can not ssh login.
【Problem Details】JED1-RR(10.220.0.2) can not ssh login. Dec 5 2014 01:15:23.80.1+03:00 JED1-RR %%01LINE/4/LOGIN_FAIL(s)[36740]:Failed to login. (Ip=10.123.7.80, Reason="The channel configuration is incorrect.")
Handling Process

1. there are 10 VTY channels,"user-interface maximum-vty 10".  it means there should be 10 user at most login this router.

2. in log, at  Dec  5 2014 01:15:04+03:00, the VTY9 is used. it means vty0 to vty9 were used then.

Dec  5 2014 01:15:04+03:00 xxxxxx LINE/5/VTYUSERLOGIN:OID 1.3.6.1.4.1.2011.5.25.207.2.2 A user login. (UserIndex=43, UserName=u2000-nms, UserIP=10.220.2.26, UserChannel=VTY9)

Dec  5 2014 01:15:07.970.1+03:00 xxxxxx %%01LINE/4/LOGIN_FAIL(s)[36738]:Failed to login. (Ip=10.123.7.80, Reason="The channel configuration is incorrect.")

Root Cause
all the vty channels are be used at that time. so can't allow new ssh user login
Solution

 if happened next time, connect console port to check how many vty can be used.
1. login by console and check:

<168>dis users

User-Intf    Delay    Type   Network Address     AuthenStatus    AuthorcmdFlag

34  VTY 0   00:04:21  TEL    10.135.87.249             pass           no        Username : root123

35  VTY 1   05:04:39  TEL    10.135.87.249             pass           no        Username : root123

36  VTY 2   01:30:45  TEL    10.135.17.206             pass           no        Username : root123

+ 38  VTY 4   00:00:00  TEL    10.135.183.76             pass           no        Username : root123

 

2. use following command to free the channel

<168>free user-interface vty ?

  INTEGER<0-14,16-20>  Specify a user terminal interface and configure it

END