System information

How do I connect Observer to a Probe across a Firewall? 439
Load Driver Could Not Open VMONI1 Service
Observer is telling you that you have not installed the VMON50 Service under Windows.
You will need to follow the instructions for installing Observer.
Problems Licensing Your Product
“My license numbers do not work”
• Make sure you are licensing the correct version of the product. License numbers are
version specific, and will work within all equal major version numbers of a product.
For example, the license number for Observer 7.0 will work with Observer 7.1, but
not with Observer 8.0. To obtain a license number for a new version, please see the
upgrade policy for that product, or contact Network Instruments or your local
distributor. Note that identification numbers are based on your name and company
name and do not change from product version to version or product to product.
The license number you received is based on the text that you typed in the name and
company fields in the licensing dialog. You must type in your name and company
EXACTLY as you see it printed on the RTU (Right To Use) certificate that was supplied
to you. Each character, each space, each punctuation mark is used to create your customer
identification number. The license number (for your product version) is based on your
identification number
How do I connect Observer to a Probe across a
Firewall?
To connect Observer to a Probe across a firewall, you need to manually configure the
firewall to let Observer use specific ports.
Observer versions 8.0 and greater use ports 25901 and 25903 for all communication
between Observer and an Advanced Probe. Therefore, you must configure the firewall to
allow traffic on these ports. To use an RMON Probe, you must allow traffic on port 161.
Observer versions 7.x and lower used ports 901 and 903 to transfer data and commands
between the Probe and the Observer console. As of version 8.0, ports 901 and 903 are only
used (once) for upgrading version 7.x probes to the current version. It is only necessary to
open up these ports if you have older version Probes on the other side of the firewall that
need to be upgraded.