Frequently Asked Questions

High Availability

• What is the High Availability Protocol used on the Kemp LoadMaster?

• Do you recommend the active use of the feature "Switch to Preferred Server" within HA Parameters?

• How does VMAC work and how can it improve HA failover?

• Is there a way to change the interface that is used to send HA updates and persistency updates?

• I am on my HA pair’s WUI but I do not see any where to add a virtual service, certificate or check my usage statistics.

• How do I decide which interfaces to use for HA Checks?

• I initially purchased a single LoadMaster, but now I am interested in purchasing a second unit to arrange them in a high availability pair. Is this possible and what would be the easiest way to accomplish this?

• What do the colored boxes at the top my HA LoadMaster's WUI represent?

Show More

---

Transparency

• Why can’t I access my real servers using RDP?

• What does Transparency mean?

• For transparency, I have my real servers pointing to my LM. How do I get access to my real servers via RDP?

• What is L7 Transparency and why doesn't my virtual service work when it is enabled?

Show More

---

LoadMaster

• How to update the license on a LoadMaster?

• Can I use offline licensing with a Free LoadMaster?

• How to backup the loadmaster via SCP?

• How to backup the loadmaster via FTP?

• How to backup and restore the LoadMaster certificates?

• How to backup the loadmaster automatically?

• How to backup and restore the loadmaster configuration?

• What Load-Balancing scheduling methods are available on the Kemp LoadMaster?

Show More

---

Backup

• How to backup the loadmaster via SCP?

• How to backup the loadmaster via FTP?

• How to backup and restore the LoadMaster certificates?

• How to backup the loadmaster automatically?

• Automated backup

• How to backup and restore the loadmaster configuration?

• How do I upload my configuration from my Master unit to my Slave unit?

• How do I setup my Auto-Backup on my LM?

Show More

---

Configure

• how to setup syslog?

• how to setup email logging?

• What is a Reverse Proxy?

• How does drain time connections work?

• Disable Real Server

• Add Radius server to the Load Master

• SSH access

• Enable L7 transparency

Show More

---

General

• What are the supported Hypervisor Platforms for a Kemp Virtual LoadMaster?

• Templates for the LoadMaster

• What are the Advantages and disadvantages of Direct Server Return (DSR)?

• Does the Kemp LoadMaster come with support?

• How does healthchecking work?

• What is the HyperText Transfer Protocol (HTTP)

• Why do my real servers come in and out of service frequently?

• What is Drain Stop and when does it affect traffic?

Show More

---

Scheduling

• What Load-Balancing scheduling methods are available on the Kemp LoadMaster?

• Why is the traffic to a Least Connection service unbalanced?

• What are some pitfalls regarding Adaptive Scheduling

• What is Port Following and how can I set it up?

• When setting up my scheduling method to adaptive agent, is the any requirements needed in-order for this to work?

• What if I do not want to balance my servers, but I would like the LoadMaster to provide tiered server redundancy?

Show More

---

Troubleshoot

• Log Message: kernel: __ratelimit: x callbacks suppressed

• Log Message: "EOF or Incorrect data received"

• Log Message: "Connection Failed - Failed SSL negotiation"

• Log Message: "Connection Failed - server unavailable"

• Log Message: "Connection Failed - unreachable host"

• Log Message: "Timeout waiting for connection"

• Log Message: L7: Real Server Connect attempt failed (x.x.x.x:p->y.y.y.y:p)

• Log Message: "Timeout waiting for data"

Show More

---

Firmware

• How to upgrade firmware?

• Can I upgrade from firmware X to the current GA firmware?

• Does my LoadMaster support the latest firmware?

• What firmware do I need to license a new subscription record?

• What is the recommended firmware?

• Do you have a list of publicly known bugs in your general available firmware releases?

• Rollback to previous version of the firmware on the load master

• If I upgrade the firmware on my LoadMaster but encounter problems, will I be able to revert to the previous state?

Show More

---

Security

• Can I use one SSL certificate on my Virtual Service for deploying multiple domains?

• How can my LoadMaster help mitigate the impact of a DDoS?

• What kind of limitations will I face if I choose to use SSL pass through?

• My company hosts a website that uses HTTPS. I would like to lessen the burden on the servers by having the LoadMaster decrypt the traffic before it is sent to my server pool, is this possible?

• What does the SSL option re-encrypt do on a VS?

Show More