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jxmot_wd avatar Server

Apache: Why do GET requests fail between domains that are sharing an IP?

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jxmot_wd

As the subject says, I am having trouble making GET requests between domains that share an IP. This was working for quite some time but in the past couple of years it started happening.

When the problem occurred I would notify my support contact (they contact the hosting provider) and a while later the problem would "go away". But only for a while. Sometimes it would be months between occurrences, sometimes just a couple of weeks or days. And sometimes the problem would go away on its own without contacting support.

Unfortunately I don't have access to the server logs that may help me because the domain accounts are in a "jailed shell". I can access the PHP error logs and those will only tell me a connection has timed out.

I did research the problem. But came up with nothing that pointed to the cause(even if it was me!). The closest I've came is finding some possible connection between a firewall and mishandling of IPV4/IPV6.

Then I tried to characterize the problem to see exactly what was and wasn't failing. That effort can be seen here.

I would really like to understand what the cause is and find a work around or a proper fix if possible.

Thanks in Advance!

jxmot

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