Slow access to webex.com with SGOS 5.5


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Solution

Overview

You may experience slow access to <yourhost>.webex.com with SGOS 5.5.1. Investigations show that it happens under the following conditions :
- short DNS TTL of 60 seconds for galaxy*.webex.com which is a CNAME for <yourhost>.webex.com
- DNS server not responding to our IPv6 DNS lookup. A few retries on the IPv6 DNS lookup will consume time and in turn, SG has less time to access the site before the DNS entry expires
- our attempts to perform the IPv6 DNS lookup whenever the IPv4 DNS cache expires, which is every 60 seconds
 

Cause
Resolution

The following CPL should address the problem:

<Forward>
 server_url.domain=webex.com server_url.dns_lookup(IPv4-Only)

<Proxy>
 server_url.dns_lookup(IPv4-Only)

Workaround
Additional Information
Bug Number
InQuira Doc IdKB3664
Attachment

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First Published      10/01/2014
Last Modified      10/01/2014
Last Published      10/01/2014
Article Audience
Product      ProxySG
Software      SGOS 5.5
Topic      Networking, Operating System, Performance
Article Number      000013564
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