# Find firewall ports used by Canon scangearmp2 utility
**URL:** https://forums.rockylinux.org/t/find-firewall-ports-used-by-canon-scangearmp2-utility/11575
**Category:** Rocky Linux Help & Support
**Created:** [October 12, 2023, 1:38pm UTC](https://forums.rockylinux.org/t/find-firewall-ports-used-by-canon-scangearmp2-utility/11575 "2023-10-12T13:38:45Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@microlinux](https://forums.rockylinux.org/u/microlinux)
#### Post date: [October 12, 2023, 1:38pm UTC](https://forums.rockylinux.org/t/find-firewall-ports-used-by-canon-scangearmp2-utility/11575/1 "2023-10-12T13:38:45Z")
Hi,
Our local school just purchased a Canon GX7050 printer/scanner.
All clients are running a custom blend of Rocky Linux 8 with KDE from EPEL.
The printer works perfectly so far.
The scanner refuses to work with Simple Scan. Apparently it needs its own `scangearmp2` utility which can be downloaded on Canon’s website.
When launching `scangearmp2` from the command line (apparently there’s no corresponding `.desktop` file included) the utility can’t seem to find the scanner on the network.
I tested it again by completely disabling FirewallD, and now the scanner is found. So for the moment I added the printer/scanner’s IP address to FirewallD’s `trusted` zone.
Canon has absolutely no documentation for either its drivers or utilities under Linux. Here’s my question: how do I know which TCP and/or UDP ports I have to open for the `scangearmp2` utility to work correctly?
Cheers,
Niki
---
### Author:  [@iwalker](https://forums.rockylinux.org/u/iwalker)
#### Post date: [October 12, 2023, 1:46pm UTC](https://forums.rockylinux.org/t/find-firewall-ports-used-by-canon-scangearmp2-utility/11575/2 "2023-10-12T13:46:21Z")
Easiest would be fire up wireshark when running the program - in the wireshark output you should see what ports it has used to connect to the printer/scanner with.
Another alternative is to run in a console:
```auto
watch -n1 'ss -taun' | grep x.x.x.x
```
where x.x.x.x is the IP of the printer, and see what ports your machine connects to when running that program.
---
### Author:  [@system](https://forums.rockylinux.org/u/system)
#### Post date: [December 11, 2023, 1:47pm UTC](https://forums.rockylinux.org/t/find-firewall-ports-used-by-canon-scangearmp2-utility/11575/3 "2023-12-11T13:47:11Z")
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