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Intermittent SSL Negotiation Delays or Slowness
07-24-2019, 01:42 AM (This post was last modified: 07-24-2019 01:56 AM by pha3z.)
Post: #3
RE: Intermittent SSL Negotiation Delays or Slowness
Thank you for the response!

So based on what you said, I looked at my apache2 modules to see if maybe there was a module enabled that does rate-limiting. I don't see anything to that effect, and I'm pretty sure I would remember if I had enabled a rate-limiting module. (But I could have forgotten and just not be seeing it. Tongue)

It's a fairly typical base Apache/2.4.18 install on ubuntu 16.04.6 LTS.

The server runs in Amazon EC2, so I find it hard to believe it's a network issue. But I'm sure you know some things I don't!

When the TCL handshake occurs, I presume the client initiates a single socket connection to the server and the the handshake is negotiated over that socket, yes?

I suppose one way to prove whether or not its a general rate-limiting issue would be to disable SSL and see if there are connection delays on vanilla HTTP. I'll try that first.

Ok, well your response was definitely helpful!

I disabled SSL and tested the site over HTTP.

Here are the results:
Dianna Houx Coaching without SSL Results

The same intermittent delays that last nearly two seconds still occur, but they show as ordinary resource delays now.

Clearly the problem is NOT SSL.

It definitely seems like a rate-limiting issue. It looks like a new connection is accepted and then the server just sits there and decides to wait before sending any actual data.

Hmmm Huh

I can see how this could *technically* be a transient network problem. But dang... how would I figure out if that's the cause? And if it is, then what do I do? Move my site to a different data center? Or a different host even?

Idea I could move to a different Amazon datacenter! That seems like a last resort test, but it's an option.
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RE: Intermittent SSL Negotiation Delays or Slowness - pha3z - 07-24-2019 01:42 AM

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