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# Troubleshooting the appliance network setup

## Appliance cannot access the network

##### Symptom

Operations that require network access do not function.

##### Cause

The appliance network was not properly configured.

##### Action

1. Log in as Infrastructure administrator.

2. Verify that the IP address assignment is correct.

3. Verify that the DNS IP address is correct.

4. Verify that the DNS server is not behind a firewall.

   If it is, modify the firewall settings.

5. Verify that the DNS server is operational.

6. Verify the gateway address for your network is correct.

7. Log in to the appliance as Infrastructure administrator and correct the network settings.

## Appliance cannot retrieve DNS information from DHCP server

##### Symptom

The DHCP server does not provide access to IP addresses.

##### Cause

DNS or the DHCP server was not properly configured

##### Action

1. Verify that each DNS IP address is correct.

2. Verify that the DNS server is not behind a firewall.

   If it is, you might need to modify the firewall settings.

3. Verify that the DNS server is operational.

4. Use the virtual appliance console to determine that the DHCP server is configured correctly.

5. If necessary, use static address assignment instead of DHCP.

## DNS server is unreachable

##### Symptom

An alert message reports that an `IP address` is not responding as a DNS server.

##### Action

Minimum required privileges: Infrastructure administrator

1. Verify that each DNS IP address is correct.

2. Verify that the DNS server is operational.

3. Verify that the DNS server is not behind a firewall.

   If it is, you might need to modify the firewall settings.

4. Change the network settings accordingly.

## Gateway server is unreachable

##### Symptom

An alert message reports that an `IP address` is not a valid gateway.

##### Action

Minimum required privileges: Infrastructure administrator

1. Verify the gateway address for your network.

2. Verify that the gateway server is operational.

3. Change the network settings accordingly.

## Cannot change network settings

##### Symptom

You are unable to change network settings.

### Improper permission

##### Action

1. If possible, log in as a privileged user. Otherwise, request that the Infrastructure administrator change your role so that you can change network settings.

2. Log in again.

3. Change the network setting.

## NTP synchronization fails

##### Symptom

Appliance time and date settings do not match the NTP server

### Appliance is not properly configured for NTP

##### Cause

The configuration of the appliance contains an error.

##### Action

1. As an Infrastructure administrator, verify that the host name or IP address you specified is an NTP server.

2. Examine the Appliance panel of the Settings screen to confirm that the IP address of the NTP server is correct.

3. Verify that the NTP server is not behind a firewall.

   If it is, you might need to modify the firewall settings.

4. Verify that the NTP server is up and communicating.

5. Follow the procedure to Synchronize the appliance clock with an NTP server.

   Allow sufficient time for the appliance and the NTP server to synchronize. This could be as long as one hour for a global NTP server.

### Appliance time differs from NTP server by more than 1000 seconds

##### Cause

The appliance cannot synchronize with the NTP server

##### Action

1. Edit the appliance time and locale settings.

   For a virtual appliance, synchronize the appliance with the VM host to synchronize the appliance’s time to the current time according to the VM host.

   For a physical appliance, set the appliance’s time manually.

2. Verify that the time according to the appliance matches the NTP server’s time.

3. Synchronize the appliance with the NTP server.

   | NOTE: HPE recommends using four NTP servers while synchronizing the appliance.

   Allow sufficient time for the appliance and the NTP server to synchronize. This could be as long as ten minutes.

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