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PEER_E_FW_BLOCKED_BY_POLICY
The state transition represented by the HRESULT
PEER_E_FW_BLOCKED_BY_POLICY — HRESULT 0x80637009 marks Group Policy blocks the Windows Peer Collaboration Foundation firewall exception. A previously successful call does not guarantee that the later handle, identity, record or network presence is still valid.
Reconstruct the sequence
- Identify the first call among Windows Firewall with Advanced Security policy and Peer Collaboration listener that returned the HRESULT.
- Preserve effective firewall policy, rule provenance, domain/private/public profile, policy refresh time and local rule state.
- Correlate graph, group, PNRP and collaboration events with application cancellation, disconnect, shutdown and sign-out events.
- Run the narrow comparison: compare the effective rule set on a policy-managed host with an approved reference policy; do not attempt to override it locally.
Peer Collaboration provides serverless presence, contacts, endpoint subscriptions and invitations. Its operations depend on an interactive user context, explicit sign-in scopes and firewall/privacy consent.
Interpretation matrix
| Observation | Interpretation |
|---|---|
| No create, open or enumerate call returned the object | The failure is upstream of the presence session described here. |
| A close, delete, disconnect, expiration or sign-out event came first | Investigate an object-lifetime race before malformed network data. |
| The controlled run advances to another HRESULT | The original invitation workflow was corrected and the new code names the next unmet prerequisite. |
Closest alternative diagnosis
PEER_E_FW_EXCEPTION_DISABLED differs because a merely disabled local rule is different from an enforced policy prohibition. The two codes can occur in one workflow, but they do not justify the same remediation.
Correction and proof
Request a narrowly scoped policy change from the administrator or use an architecture allowed by the environment. Verify the result by enumerating the expected records, members, connections, endpoints or presence state rather than merely observing that the call stopped failing.
Source material
- Microsoft: About the Peer Collaboration API — it uses this source for the documented peer boundary.
- Microsoft: Collaboration API functions
- Microsoft: People Near Me requirements
- Microsoft: Windows Firewall rules
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