Linkus Login Failed through LCS - Error Code 3

Applicability
  • Firmware version: Any
  • Model: S-Series
 
Problem Description
 
Login Linkus by LCS. But it shows Failed to connect - Error 03
LCS is well activated.
 
 
Analysis
 
First you would need to know the normal login message flow.
 
PUBLICKEY -> EXCHANGEAESKEY -> LOGIN
 
PBX Linkus log shows the Login message flow is normal
 
mceclip1.png
 
Client Linkus log shows it didn't receive 200 OK packet from PBX.
 
mceclip2.png
 
The PCAP capture on PBX shows a few ICMP - Destination Unreachable packets.
The error indicates the MTU of the next hop is 1000.
 
mceclip0.png
 
But the 200 OK packet for Login is larger than 1000 Byte.
 
Solution
 
Change the MTU from 1000 to 1500 on the Router.  

mceclip0.png

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