Port 80 weird?

Hello All,

Today I just experienced something new that I can't quite explain.

I have 10 servers in two different rooms at the same ISP.
5 in front and the other 5 behind the firewall.

The servers were running fine until I encountered a big slowdown this morning.
The technician at the ISP said that it was due to clearing their main cache???? (didn't want to bother with that)

So, soon after they have cleared, most of the servers went back to normal.
Except 1.
This is in front of the firewall.
I have a Fedora 4 with setup as a proxy server.
After checking for problems I noticed that port 80 was extremely slow.
All other ports were fine 21,22,25 etc...

After roughly 8 hrs of wrestling with the ISP, it went back up as normal.

Now I am glad that things are working fine, but I can't find any reasons anywhere why this happened.

I would appreciate any information in case it happens again in the future.

Thank you

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Keith AlabasterEnterprise ArchitectCommented:
Is this the only box of yours that is acting as a proxy server?

FTP, SSH, SMTP etc are not affected by cache so these ports should not be affected by cache changes.
I am assuming that the ISP proxy cache is hit (externally) before your own proxy server? A possibility... Any hits on your boxes would now be direct rather than fielded by the ISP's Proxy until their cache began to populate again therefore impacting on your port 80 traffic, the main user of caches.

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luvcooperationAuthor Commented:
Thank you for the explanation.

Is it normal to take ~8 hours for the cache to populate?

Keith AlabasterEnterprise ArchitectCommented:
To be honest, I wouldn't have thought so and I would point out that this synopsis is just one possibility. The unknown factor of course is 'did the ISP simply make a boo-boo' and it took a while for them to correct it.


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