​Port knocking is a method of externally opening ports, which, by default, the firewall keeps closed, by generating a connection attempt on a set of pre-specified closed ports.
Termius provides a port knocking client supporting both UDP / TCP protocols and inter-packet delays.
To send a knock sequence in Termius, you'll need to:
1.
Create a port knocking type of snippet (see below).
2.
Run it from the Snippets screen.
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You must have a port knock daemon running on your server to be able to use this feature.
Port knocking is a premium feature.
Create a Port Knocking Snippet
Mobile
1.
Navigate to the Snippets screen.
2.
Tap + and then Port Knocking Snippet.
3.
(Optional) In the Name field, specify the name of the snippet.
4.
(Optional) In the Default Destination field, specify a host that will be receiving the knock sequence.
5.
In the Knock Sequence section, create a knock sequence. Each item in the sequence is either a TCP or UPD packet sent to a required port, or a delay (pause).
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Tap and hold an item in the sequence to re-arrange it.
Creating and running a port knocking snippet (iOS)
Port knocking is currently available in mobile apps only.