How to add MetaMask to a whitelist on a restricted network for normal use?

### What is this about?

Hello, we are using the Google Chrome MetaMask extension wallet. How do we set up a whitelist in a restricted network (Fortinet firewall)? We are currently unable to log in to the wallet, even though the RPC address has been added to the whitelist.The problem was not resolved after contacting online customer service.

### Scenario

_No response_

### Design

_No response_

### Technical Details

_No response_

### Threat Modeling Framework

_No response_

### Acceptance Criteria

_No response_

### Stakeholder review needed before the work gets merged

- [ ] Engineering (needed in most cases)
- [ ] Design
- [ ] Product
- [ ] QA (automation tests are required to pass before merging PRs but not all changes are covered by automation tests - please review if QA is needed beyond automation tests)
- [ ] Security
- [ ] Legal
- [ ] Marketing
- [ ] Management (please specify)
- [ ] Other (please specify)

### References

_No response_

No files, tests, or entry points are identified. Start by clarifying the Chrome extension login failure and the required Fortinet whitelist configuration; the empty acceptance criteria provide no defined completion condition.

Written by the indexing model from the issue text.