If you're just looking to tell the firewall to regenerate the self-signed certificate, you can do so via the Firebox's CLI.
Using PuTTY or another SSH application, connect to your firewall using the SSH protocol, but change the port to 4118. You will want to connect as admin, and use your admin passphrase.
If you are using SSH via the command line of a linux/unix/MacOS machine, the command to do this will be (or be similar to)
ssh admin@10.0.1.1 -p 4118
(be sure to specify the correct IP for your firewall)
when you're at the WG# prompt, type "upgrade certificate web"
If you'd like to generate a custom certificate, CSR, or import your own cert, the KB article Tristan posted above shows how to do this.
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https://techsearch.watchguard.com/KB?type=Article&SFDCID=kA10H000000g3XMSAY&lang=en_US
If you're just looking to tell the firewall to regenerate the self-signed certificate, you can do so via the Firebox's CLI.
Using PuTTY or another SSH application, connect to your firewall using the SSH protocol, but change the port to 4118. You will want to connect as admin, and use your admin passphrase.
If you are using SSH via the command line of a linux/unix/MacOS machine, the command to do this will be (or be similar to)
ssh admin@10.0.1.1 -p 4118
(be sure to specify the correct IP for your firewall)
when you're at the WG# prompt, type "upgrade certificate web"
If you'd like to generate a custom certificate, CSR, or import your own cert, the KB article Tristan posted above shows how to do this.
-James Carson
WatchGuard Customer Support