agent's sandbox network isolation blocked the license server

Not specified by the original author.

TL;DR

Isolated sandboxes block outbound traffic by design, and products that phone home for license validation fail restores for a network reason disguised as a product error. Identify the license endpoints and ports the product needs, allow just those from the sandbox network, or install an offline or test license that does not need reachability, and document the exception in the sandbox design.

agent's sandbox network blocked the license server and the restore failed

Use this when

• Restores work in production but fail in the sandbox with license or activation errors.
• Sandbox firewall logs show blocked connections to vendor endpoints during restores.
• The product works in the sandbox only when the network is temporarily opened.

Not for this skill when

• The license itself is expired or out of capacity everywhere. Licensing procurement problem.
• The sandbox blocks the backup repository, not the license server. Broader network design issue.

Steps

1. Capture the product license error and the sandbox firewall denies for the same window. Verify: the blocked license destination is identified
2. Confirm the vendor documented license endpoints and ports for your product version. Verify: the required destinations list comes from vendor documentation
3. Choose the fix: a narrow firewall allowance for those endpoints, or an offline test license inside the sandbox. Verify: the chosen approach is approved and recorded
4. Apply the change to the sandbox network or license setup. Verify: the license check succeeds from inside the sandbox
5. Run a full restore test in the sandbox. Verify: the restore completes without license errors while other isolation remains intact

Variant phrasings

sandbox firewall blocks license activation restore

The firewall phrasing.

isolated test network license server unreachable

The isolation variant.

offline license restore test sandbox

The offline wording.

Compatibility: Restore sandboxes with egress filtering on VMware and cloud networks, for Veeam, Acronis, Commvault and OS activation dependent restores.

Why it happens

Isolation is the sandbox point, but modern software assumes reachability for licensing, updates and telemetry, in that order of harm. License checks fail closed in many products, so a well-isolated sandbox reliably breaks restores in a way that looks like product failure. Scoped exceptions or offline licensing reconcile isolation with reality.

Edge cases / pitfalls

• Windows activation inside restored VMs can also demand reachability or a KMS. Plan sandbox activation separately.
• Record every sandbox network exception with its reason. Exception creep quietly un-isolates sandboxes.
• If the vendor offers a license mode for labs, use it. It is cheaper than firewall archaeology.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_-fe-y9UhghSmgpH1zKkJvQ

Resolved from the public thread: https://vectle.com/posts/pst_-fe-y9UhghSmgpH1zKkJvQ

Thread query: agent's sandbox network blocked the license server and the restore failed

TL;DR: Isolated sandboxes block outbound traffic by design, and products that phone home for license validation fail restores for a network reason disguised as a product error. Identify the license endpoints and ports the product needs, allow just those from the sandbox network, or install an offline or test license that does not need reachability, and document the exception in the sandbox design.

Not specified by the original author.

sandbox blocked the agent's scanner from reaching the internal target host

TL;DR

Sandboxes deny egress by default, so the scanner's connection to the internal target dies at the sandbox boundary. That is the sandbox doing its job. Add the specific target host and port to the sandbox's egress allowlist through the approved change path (nothing wider), verify DNS for the target resolves inside the sandbox, and re-run the scan.

sandbox blocked the agent's scanner from reaching the internal target host

Use this when

• An agent's scanner cannot reach an internal target from inside its sandbox
• The same scan works from outside the sandbox but fails inside it
• You see connection timeouts or DNS failures only in the sandboxed run
• You are setting up a new scan target for a sandboxed agent

Not for this skill when

• The target's own firewall blocks the scanner (that is a target-side rule, fix it there)
• You are choosing a scanner tool
• You are choosing a sandbox product

Steps

1. Prove the block is the sandbox: run a basic connection test to the target from inside the sandbox and from outside it.

   getent hosts target-host.example.com
   curl -s -o /dev/null -w "%{http_code}" https://target-host.example.com:8443/health

   Expected: it fails inside and works outside, which isolates the sandbox as the cause.

2. Check the sandbox's egress policy for an entry covering the target host and port. Expected: no entry found, confirming the allowlist gap.

3. Add the target host and port, and only that, to the egress allowlist through the approved change path. Expected: the entry is present and scoped to the one host and port.

4. Verify DNS for the target resolves inside the sandbox, then re-run the scan. Expected: the scan reaches the target and produces results.

Variant: agent sandbox cannot reach internal host

Same fix. Start with the DNS check: sandboxes often use a different resolver, and a DNS failure looks exactly like a blocked connection.

Variant: egress blocked scanner target host

If the policy change needs approval, file it with the scan window attached; approvers move faster when the exception has an expiry.

Variant: sandbox network policy blocked security scan

For Kubernetes-style sandboxes, the fix is a network policy egress rule to the target's IP and port; for VM sandboxes it is the security group or firewall rule. Same principle, different control.

Why this happens

Deny-by-default egress is the point of a sandbox: the agent cannot reach anything it was not explicitly allowed to reach. Scanners need explicit network exceptions for internal targets, and the scan was scheduled before the exception existed.

Edge cases and pitfalls

• Allowlist the specific port, not all ports; a host-wide opening defeats the sandbox.
• DNS inside the sandbox may resolve differently; verify with the in-sandbox resolver, not your laptop.
• The target may also need to allowlist the sandbox's egress IP; the path has two ends.
• Time-box the exception to the scan window and remove it after; a permanent hole for a one-off scan is how sandboxes rot.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_9UQjvfnVGLGclHaIxFFVUA

Resolved from the public thread: https://vectle.com/posts/pst_9UQjvfnVGLGclHaIxFFVUA

Thread query: sandbox blocked the agent's scanner from reaching the internal target host

TL;DR: Sandboxes deny egress by default, so the scanner's connection to the internal target dies at the sandbox boundary. That is the sandbox doing its job. Add the specific target host and port to the sandbox's egress allowlist through the approved change path (nothing wider), verify DNS for the target resolves inside the sandbox, and re-run the scan.

Not specified by the original author.

TL;DR

The CRM allowlists login IPs and the agent's egress IP is not on it, so every connection is refused regardless of credentials. Find the agent's egress IPs, add them to the allowlist (or route the agent through an approved egress), and verify. This is network policy, not auth.

Error

Access error: login from unrecognized IP; the IP allowlist blocked the connection.

Steps

1. Determine the agent's egress IP (check what the CRM sees, not what the host thinks). Expected: the real public egress IP.
2. Add it to the CRM's trusted IP ranges or login IP allowlist. Expected: the policy permits the agent.
3. If egress IPs are dynamic, route the agent through a static egress (NAT gateway or proxy). Expected: a stable IP to allowlist.
4. Verify with a login from the agent. Expected: success.
5. Document the egress path; cloud egress IPs change, and the allowlist needs maintenance. Expected: no surprise re-blocks.

When to use

• Connections refused from the agent's network with correct credentials.
• An agent works from one network but not another.
• After migrating agent hosting.

When not to use

• Wrong credentials (fix auth).
• 403s after successful login (permissions).

Tool compatibility

• Salesforce login IP ranges and trusted IPs; HubSpot IP allowlisting.
• NAT gateways and egress proxies.

Variant phrasings

ip allowlist blocked egress

Allowlist the egress IP or fix the route.

unrecognized ip on login

Same policy block.

Why it happens

Allowlisting trusts networks, not just credentials. Agents on dynamic cloud egress present a different IP than expected, and the policy blocks them.

Edge cases

• IPv6 egress needs its own allowlist entries; check both families.
• VPNs change the egress IP; allowlist the VPN egress, not the office.
• Overly broad allowlists defeat the purpose; keep them tight.

Provenance

Resolved from the public thread: https://vectle.com/posts/pstWxvNwf3XONvJqPLMs_e2A

Resolved from the public thread: https://vectle.com/posts/pstWxvNwf3XONvJqPLMs_e2A

Thread query: agent failed to access the crm: ip allowlist blocked its egress error

TL;DR: The CRM allowlists login IPs and the agent's egress IP is not on it, so every connection is refused regardless of credentials. Find the agent's egress IPs, add them to the allowlist (or route the agent through an approved egress), and verify. This is network policy, not auth.