Suddenly websites loading extremely slow - yet WHM & server appears fine

david26uk

Member
Apr 24, 2014
18
1
3
cPanel Access Level
Root Administrator
Hi Guys,

Last night I noticed websites on my dedicated server loading extremely slow. Here's a breakdown of the details and what I've checked thus far:

- every 3-5 minutes it returns to normal, websites load fast again.
- CPU, memory & disk usage appear fine
- Logs show no unauthorised IP's accessing the server, no unusual messages
- Checked for attacks, no duplicate IP's or excessive requests. Bandwidth is normal.
- files, scripts etc on the server haven't changed, been loading fast for months without issues
- checked on various browsers, other computers
- Strangely, some pages load fine
- about 60 domains on server in total (50+ add-on domains)

It feels like a cocktail of mixed signals and I'm struggling here. Any help would be greatly appreciated.

Thank you
 

david26uk

Member
Apr 24, 2014
18
1
3
cPanel Access Level
Root Administrator
Thank you for the guide - unfortunately it hasn't solved the problem.

- CPU & memory usage are low, load average is 0.5.
- tcpdump log not showing duplicate IP's (only search spiders)

Any further ideas to check? Do you think this could be a sign of hard disk failure?

Thanks
 

cPanelMichael

Administrator
Staff member
Apr 11, 2011
47,913
2,202
363
You could check /var/log/messages and /var/log/dmesg to see if you notice anything out of the ordinary that would indicate a failing hard drive. Your data center may also be able to assist you with this issue.

Thank you.
 

kdean

Well-Known Member
Oct 19, 2012
365
56
78
Orlando, FL
cPanel Access Level
Root Administrator
Note that it's possible for data center networking issues to cause this effect even when an attack is not directed at your server. Check Pings and Traceroutes to the server during when it's having issues to see if there is any packet loss.