Question

DNS Using Nearly Every Well Known Port

Asked by: bjblackmore

Hi,

While trying to fix a problem with IAS running on our server, I noticed that DNS seems to be using nearly every well known port, from 1000 - upwards.

I first notied when IAS stopped, and the event log said it couldn't start because the socket was in use. So I used the CurrPorts tool to view the open/listening ports, and found DNS was listening on the same port as IAS (1812). Stopping the DNS server, allowed me to start IAS again. However, when I restart DNS, it again grabs nearly every port above 1000, many of which are used by other applications.

I've run CurrPorts on our other DNS server, and this is using just port 53, 1129, 1147 and 4629 in the lower range of ports, as expected. All of the other open/listening ports are above port 49,000, which aren't well known, and so not used by other applications.

This has only happened in the past week, previously IAS was running without any interference from DNS. Why would DNS suddenly start trying to grab all of the ports in the well known range, and how can you reset it to use the upper range.

Thanks

Ben

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Asked On
2009-08-06 at 02:13:57ID24630718
Topics

Domain Name Service (DNS)

,

Miscellaneous Networking

,

TCP/IP

Participating Experts
1
Points
250
Comments
3

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