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Troubleshooting

If you find Enclave isn't working as expected, here's a simple set of troubleshooting checklists to follow. You can also search our developer community forum to see if any issue you might be experiencing have been observed by other users.

Your first port of call should always be to run enclave self-test to see if any installation or runtime problems are detected.

Platform connectivity problems

If you think Enclave is having trouble reaching our SaaS services, please work through the following checklist to identify the problem.

  1. Check https://status.enclave-networks.com/ for any disruptions or service outages

  2. Check your systems are enrolled and showing as both connected and approved in the portal

  3. Check you're running on the latest version of Enclave with enclave version

  4. Check the output of enclave status doesn't contain any warnings or errors

  5. Check the output of enclave status lists at least one Peer and the state shows as Up

  6. Check network traffic is allowed out to tcp/*:443

  7. Check network traffic is allowed out to udp/*:1024-65355

  8. Check network traffic isn't forced through a SOCKS proxy, which is currently unsupported

  9. Check local anti-virus software is not interfering with Enclave by temporarily disabling it

Problems enrolling new peers

  1. Check https://status.enclave-networks.com/ for disruptions or service outages

  2. If you're running on Linux check that the ca-certificates package is up to date

  3. Check that the date and time on the enrolling system is accurate

Traffic not flowing between peers

If Enclave appears to be connected to our SaaS services and other peers, but you can't get network traffic to cross the tunnel, please work through the following checklist to identify the problem.

  1. Check the Enclave network interface is online using ipconfig /all.

    Look for Ethernet adapter Universe in the list and check that Media State is not shown as Media disconnected. If it is, try running enclave restart and consider sharing local Enclave logs with support@enclave.io to help us investigate the problem.

    C:\> ipconfig /all
    
    Ethernet adapter Universe:
    
    Connection-specific DNS Suffix  . :
    Description . . . . . . . . . . . : Enclave Virtual Network Port
    Physical Address. . . . . . . . . : 00-FF-2C-FD-0F-12
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes
    IPv4 Address. . . . . . . . . . . : 100.117.177.98(Preferred)
    Subnet Mask . . . . . . . . . . . : 255.192.0.0
    Default Gateway . . . . . . . . . : 100.127.255.254
    DNS Servers . . . . . . . . . . . : 100.117.177.98
    
  2. Check both connected peers can each ping their own Enclave IP address listed in enclave status as the Local address:.

  3. Check that the Peer state of the peer you're trying to reach is showing as Up in the enclave status output.

  4. When trying to ping another peer connected via Enclave, check that your ping requests are targeting the Virtual address of the destination peer and not the Local address.

  5. Check the routing table on each peer is configured correctly.

    The routing table is configured automatically by Enclave so unlikely to be the source of a problem unless there are other conflicting routes already in place. Check for duplicate entries or conflicting routes in your routing table, or other network interfaces also using the 100.64.0.0/64 subnet.

    C:\> route print | findstr 100.64.0.0
    
    IPv4 Route Table
    ===========================================================================
    Active Routes:
    Network Destination    Netmask        Gateway         Interface    Metric
    100.64.0.0             255.192.0.0    On-link    100.117.177.98       281
    
  6. Check the MTU configured in the .profile files matches on both sides of the tunnel

Using Ping to verify connectivity

If you're using ping tests to verify connectivity, it's important to check that the host-local firewall is not dropping traffic arriving on the Enclave network interface.

  1. Check that the host-local firewall on both peers is not obstructing traffic flows either to, or from the Enclave network interfaces.

    On Linux the Enclave network interface is likely to be named tap0 (or similar) and on Windows the Enclave network interface is usually called Universe or Enclave Virtual Network Port.

    The easiest way to verify that the host-local firewall is not interfering with Enclave traffic is to temporarily disable it, but if that's not possible for in environment, you should ensure ping traffic (icmp type 8, code 0) is permitted by the host-local firewall.

  2. On Windows, you should check that the Enclave network interface is correctly classified by the Windows Firewall as Private and if required, create an ACL permitting inbound ICMP traffic using PowerShell:

    New-NetFirewallRule -DisplayName "ICMPv4 (In)" -Profile Private -Direction Inbound -Protocol ICMPv4 -Program Any -Action Allow`
    
  3. Check that the ACLs defined by your Policies are allowing ICMP traffic to flow on both systems by examining the ACLs reported by enclave status on each peer.

    For example, if your attempts to ping a target system are timing out, check that the system you're sending the pings from has an allow ACL like allow [X] from local -> peer where X is either [any] or includes the word icmp.

    Critically you're checking that the Enclave local -> peer ACL on the sender-side of the tunnel permits icmp (or any) to be sent. If it does, that means the peer -> local ACL on the receiver side of the tunnel also permits that traffic to be received too.

    ACLs in Enclave are symmetric, so if the sender-side is allowed to send ICMP traffic, the receiver-side will implicitly be allowed to receive it.

DNS resolution not working

  1. Obtain your Enclave local IP address using the enclave get-ip command.

    That's the IP address which the local DNS stub resolver will bind to (udp\53).

    C:\> enclave get-ip
    100.117.177.98
    
  2. Use nslookup to send a test query to the Enclave nameserver identified in step 1 by attempting to resolve the special DNS name _my.id.enclave. It should resolve to your own local Enclave IP address, the same IP as the nameserver you're querying.

    C:\> nslookup _my.id.enclave 100.117.177.98
    Server:   UnKnown
    Address:  100.117.177.98
    
    Name:     _my.id.enclave
    Address:  100.117.177.98
    
  3. If the DNS query fails, check there isn't other software bound to your Enclave Local address on port udp/53

  4. If you're running Enclave on a Linux operating system or inside a container, check that you've correctly configured DNS forwarding to ensure DNS queries from the operating system are reaching the local Enclave DNS stub resolver.

  5. Some ISPs hijack DNS queries to serve ads. Check that your primary recursive nameserver correctly returns a SRVFAIL response when queried with a hostname it should be unable to resolve. Some ISPs run nameservers which return IP addresses for ad servers instead of a SRVFAIL for non-existent domains. The ping request shown below to the non-existing hostname null.enclave.io should fail. If it does not, your ISPs nameservers may be hijacking your DNS requests to serve ads, in which case we recommend contacting your ISP to disable this function or switching to another primary resolver.

    C:\> ping null.enclave.io
    Ping request could not find host null.enclave.io. Please check the name and try again.
    

DNS queries slow to complete

  1. On Windows, check that the Enclave network interface doesn't list more than one DNS nameserver. If it does, please remove the DNS server that does not match the Enclave Local address shown by the enclave get-ip command.

Exit nodes not working

See our Exit Node troubleshooting guide.

Advanced troubleshooting

  1. Try running Enclave as a foreground process with high log verbosity enabled sudo enclave run -v 5 to inspect traffic flows.

  2. Try running tcpdump or WireShark to capture from the tap0 interface (or Enclave Virtual Network Port on Windows, usually also called Universe) and inspect the traffic flows.


If you're still having problems after following this checklist, please contact support@enclave.io or join one of our community support channels to get help and advice.

Last updated May 5, 2022