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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 means that the firewall is in a no-exceptions or block-all-inbound posture that suppresses the peer collaboration exception. The relevant API boundary includes 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 |
|---|---|
| Raw input | Preserve block-all-inbound setting for each active profile, emergency policy source, rule-group state, network category and change history. |
Focused reproduction
On an isolated test profile, compare normal inbound policy with the no-exceptions posture while keeping the peer rule unchanged.
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.
Recommended change
Remove the emergency block only through approved security policy after assessing exposure; adding another allow rule will not override all block modes.
Technical references
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