Licensing error when UFW enabled
### Describe the Bug
Hello,
On a brand new VPS, I enabled UFW as a security default. I added the rules required in the documentation.
UFW status:
```
To Action From
-- ------ ----
80/tcp ALLOW Anywhere
443/tcp ALLOW Anywhere
51820/udp ALLOW Anywhere
21820/udp ALLOW Anywhere
80/tcp (v6) ALLOW Anywhere (v6)
443/tcp (v6) ALLOW Anywhere (v6)
51820/udp (v6) ALLOW Anywhere (v6)
21820/udp (v6) ALLOW Anywhere (v6)
```
First error: unable to install Pangolin, with the installer, when UFW is enabled. It works when I disable it.
Second error: Unable to add a licence key with UFW enabled. It works when I disable it. Once the licence key is valid, I can re-enable UFW and it works like a charm.
But in the case of a restart of the container, the licence is lost and I have to disable UFW, reload the licence key, re-enble UFW.
Logs from Pangolin container:
```
2026-06-04T22:28:30+00:00 [error]: Error activating license key: TypeError: fetch failed
Stack: Error: Error activating license key: TypeError: fetch failed
at License.activateLicenseKey (file:///app/dist/server.mjs:4346:13)
at process.processTicksAndRejections (node:internal/process/task_queues:104:5)
at async activateLicense (file:///app/dist/server.mjs:32033:22)
Error while flushing PostHog [Error [PostHogFetchNetworkError]: Network error while fetching PostHog] {
error: [Error [TimeoutError]: The operation was aborted due to timeout] {
code: 23,
INDEX_SIZE_ERR: 1,
DOMSTRING_SIZE_ERR: 2,
HIERARCHY_REQUEST_ERR: 3,
WRONG_DOCUMENT_ERR: 4,
INVALID_CHARACTER_ERR: 5,
NO_DATA_ALLOWED_ERR: 6,
NO_MODIFICATION_ALLOWED_ERR: 7,
NOT_FOUND_ERR: 8,
NOT_SUPPORTED_ERR: 9,
INUSE_ATTRIBUTE_ERR: 10,
INVALID_STATE_ERR: 11,
SYNTAX_ERR: 12,
INVALID_MODIFICATION_ERR: 13,
NAMESPACE_ERR: 14,
INVALID_ACCESS_ERR: 15,
VALIDATION_ERR: 16,
TYPE_MISMATCH_ERR: 17,
SECURITY_ERR: 18,
NETWORK_ERR: 19,
ABORT_ERR: 20,
URL_MISMATCH_ERR: 21,
QUOTA_EXCEEDED_ERR: 22,
TIMEOUT_ERR: 23,
INVALID_NODE_TYPE_ERR: 24,
DATA_CLONE_ERR: 25
},
[cause]: [Error [TimeoutError]: The operation was aborted due to timeout] {
code: 23,
INDEX_SIZE_ERR: 1,
DOMSTRING_SIZE_ERR: 2,
HIERARCHY_REQUEST_ERR: 3,
WRONG_DOCUMENT_ERR: 4,
INVALID_CHARACTER_ERR: 5,
NO_DATA_ALLOWED_ERR: 6,
NO_MODIFICATION_ALLOWED_ERR: 7,
NOT_FOUND_ERR: 8,
NOT_SUPPORTED_ERR: 9,
INUSE_ATTRIBUTE_ERR: 10,
INVALID_STATE_ERR: 11,
SYNTAX_ERR: 12,
INVALID_MODIFICATION_ERR: 13,
NAMESPACE_ERR: 14,
INVALID_ACCESS_ERR: 15,
VALIDATION_ERR: 16,
TYPE_MISMATCH_ERR: 17,
SECURITY_ERR: 18,
NETWORK_ERR: 19,
ABORT_ERR: 20,
URL_MISMATCH_ERR: 21,
QUOTA_EXCEEDED_ERR: 22,
TIMEOUT_ERR: 23,
INVALID_NODE_TYPE_ERR: 24,
DATA_CLONE_ERR: 25
}
}
```
### Environment
- OS Type & Version: Debian 13
- Pangolin Version: 1.18.4
- Edition (Community or Enterprise): EE
- Gerbil Version: 1.4.0
- Traefik Version: v3.6
- Newt Version: /
- Client Version: /
### To Reproduce
sudo ufw allow 80/tcp
sudo ufw allow 443/tcp
sudo ufw allow 51820/udp
sudo ufw allow 21820/udp
sudo ufw enable
sudo ./installer > follow the installation
### Expected Behavior
The installation of Pangolin
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