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Hi Dirk,<br />
<br />
I need to scheduled for a less peak hours to have the suggested command to apply. I will update you about the result, thanks.
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Hi Dirk,

I need to scheduled for a less peak hours to have the suggested command to apply. I will update you about the result, thanks.

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Thanks for expert - Kirk for his suggestion. It works.
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Thanks for expert - Kirk for his suggestion. It works.

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<div class="content wysiwyg-content">
This is using 5 Citrix xenserver as hosts, all joined to the XenCenter pool. Among these 5 xen hosts, 4 are in site A, while the fifth one is located at site B. Site A connected to site B with firewall IPsec tunnel site-to-site. The ping tests took 300ms echo reply. This setup was done 4 years ago, and all along working fine.<br />
<br />
Recently, I logged into the xencenter pool, and found that the fifth xen is in &quot;red&quot;. I need to modify few settings and couldn't access. Please see the attached jpg file. What went wrong, and what should I do to make it &quot;come alive again&quot;? There are few VMs hosted there, and VMs are working fine. Shall I remove this host from the pool (with affecting VMs)?<br />
<br />
Thanks in advance.<br />
<a href="https://filedb.experts-exchange.com/incoming/2016/12_w53/1135493/EE---Xen-Host-unreachable.JPG" target="_blank" class="file-inline" title="EE - Xen Host shows RED (37 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>EE---Xen-Host-unreachable.JPG</a>
</div>
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EE---Xen-Host-unreachable.JPG

This is using 5 Citrix xenserver as hosts, all joined to the XenCenter pool. Among these 5 xen hosts, 4 are in site A, while the fifth one is located at site B. Site A connected to site B with firewall IPsec tunnel site-to-site. The ping tests took 300ms echo reply. This setup was done 4 years ago, and all along working fine.

Recently, I logged into the xencenter pool, and found that the fifth xen is in "red". I need to modify few settings and couldn't access. Please see the attached jpg file. What went wrong, and what should I do to make it "come alive again"? There are few VMs hosted there, and VMs are working fine. Shall I remove this host from the pool (with affecting VMs)?

Thanks in advance.

Xen host became unreachable in the xencenter pool, why?

Citrix is the synonym for the virtualization and application infrastructure systems developed by the company of the same name. Main areas are application virtualization, Software-As-A-Service (SaaS), cloud-computing and networking. The two most well-known are Citrix XenApp or Citrix CloudPlatform.

Citrix

Internet Protocol Security (IPsec) is a protocol suite for secure Internet Protocol (IP) communications by authenticating and encrypting each IP packet of a communication session. IPsec includes protocols for establishing mutual authentication between agents at the beginning of the session and negotiation of cryptographic keys to be used during the session. IPsec can be used in protecting data flows between a pair of hosts (host-to-host), between a pair of security gateways (network-to-network), or between a security gateway and a host (network-to-host). IPsec is an end-to-end security scheme operating in the Internet Layer of the Internet Protocol Suite.