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.
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.