What is this?

This knowledgebase contains questions and answers about PRTG Network Monitor and network monitoring in general.

Learn more

PRTG Network Monitor

Intuitive to Use. Easy to manage.
More than 500,000 users rely on Paessler PRTG every day. Find out how you can reduce cost, increase QoS and ease planning, as well.

Free Download

Top Tags

View all Tags

icmp problems with v9




i have been having all sorts of icmp problems since moving to version 9 ( from version 8. on my ping sensors, i am now getting a lot of packet loss when there is no actual packet loss on the circuit/path. also, certain devices report ICMP error 11050 from time to time which throws a sends a notification (and i think the device is down or unreachable) when in reality, it is not. i have tried tweaking all sorts of settings, increasing the icmp packet size, reducing the scan interval, but nothing seems to work.

any help would be greatly appreciated.

icmp problem prtg upgrade

Created on Mar 2, 2012 4:02:10 PM

2 Replies



ICMP error 11050 seems to be firewall related. Please check your hard and software firewall settings.


Created on Mar 3, 2012 7:21:01 PM



i tried a couple different firewall configurations on the prtg server-

a) on with exceptions b) off from gui c) windows firewall service disabled

and all had the same behavior. on friday, i upgraded to the latest version ( and all is well again.

Created on Mar 5, 2012 4:04:10 PM

Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.