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100% Packet Loss in a site-to-site but Network Route is fine showing hops between the agent PCs

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100% Packet Loss in a site-to-site but Network Route is fine showing hops between the agent PCs

site-to-site 100% packet loss (UDP) (but Network Route connecting fine (ICMP)) due to inbound UDP blocked by Windows Firewall on Agent PCs?

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Community Manager

Re: 100% Packet Loss in a site-to-site but Network Route is fine showing hops between the agent PCs

Here is a short video on this 100% packet loss scenario.

 

There is obviously good ICMP connectivity because the Network Route is looking good. It's just that the Packet Loss is showing 100% which means that the RTT (Round Trip Time Latency), Jitter and Out of Order stats are all invalid (and are all 0 when they are invalid) because the 100% packet loss in a site-to-site assessment means that the UDP on port 50001, 50002 etc is not getting through or not coming back.

 

 

 

Summary 

  • How to troubleshoot 100% Packet Loss in UC Assessor
    site to site assessment.
  • Packet Loss 100%
    Burst Packet Loss 100%
    Jitter, RTT, Out of Order: all 0% (invalid)
  • Reason: UDP connection failing between agents
  • Network Route good
  • Reason: ICMP connection is successul between agents

Common Causes
- network firewall?
- Windows Firewall on the Agent PCs?
- Anti-virus on Agent PCs?

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