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A restart to the HTTPD proxies often fixes many issues. One issue might be that the load balancer a proxy is pointing to might change over time. If this happens, and our DNS TTL is infinite, it will eventually point to the wrong location. this may result in a 404 or a hung connection (gateway timeout).
For the proxy entries, we might want to set some parameters:
addressttl -1 TTL in seconds for how long DNS resolutions of the backend address are cached. -1 means until restart of Apache httpd.
This might help as restarting the proxy often fixes the issues, which is indicative of the above.
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