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PEER_E_FW_BLOCKED_BY_SHIELDS_UP
Which peer contract was rejected
PEER_E_FW_BLOCKED_BY_SHIELDS_UP — HRESULT 0x8063700A marks the firewall is in a no-exceptions or block-all-inbound posture that suppresses the peer collaboration exception. The base description names the outcome; diagnosis requires the data contract and lifecycle accepted by Windows Firewall profile settings and Peer Collaboration listener.
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.
Minimum diagnostic packet
| Item | Evidence for it |
|---|---|
| Raw input | Preserve block-all-inbound setting for each active profile, emergency policy source, rule-group state, network category and change history. |
| Owning context | Record the Windows user, process integrity, graph or group handle, database path and selected cloud. |
| Previous success | Save the last successful create, open, enumerate, parse, register or sign-in result that produced the object. |
| Result order | Retain the first HRESULT so cleanup failures do not replace the code that rejected the request. |
Focused reproduction
On an isolated test profile, compare normal inbound policy with the no-exceptions posture while keeping the peer rule unchanged. Use disposable identities or groups when the test publishes names, creates credentials or modifies a replicated database.
Why the comparison code is different
PEER_E_FW_BLOCKED_BY_POLICY differs because shields-up is the profile-wide no-exceptions posture; blocked-by-policy can target the specific peer rule group. A diagnostic report should retain both the symbolic constant and the unsigned hexadecimal value.
Recommended change
Remove the emergency block only through approved security policy after assessing exposure; adding another allow rule will not override all block modes. Avoid deleting every peer database, certificate store or firewall rule because broad resets erase evidence without proving the caller contract was repaired.
Proof of repair
- The original input now passes the precise check represented by this HRESULT.
- The operation reaches the intended graph, group, record, PNRP or collaboration outcome.
- Unrelated identity material, membership credentials and replicated records remain unchanged.
Technical references
- 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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