I just migrated to virtualmin from cpanel / whm.
Everything went well for 3-4 days but now, my sites are not accessible any more. I tried to debug Apache / PHP but could not find any issue. The pages are starting to download but after a while connection is reset.
Later I discovered that I can upload files very fast to the server (4-5 MB / sec) but downloading via web browser and even an scp client is working with only 2-4 KB / sec!!! Is there a bandwidth limit enabled, how should I check what is limiting my access to the sites and cause the slow page downloading?
I stopped fail2ban, iptables show no blocking rules, I have no idea what else should I check.
The main issue seems to be the slow speed of download between my location and the server. But I have other servers on the same DC and download works very well between my location and the other server. This is why I assume there is some kind of built in bandwidth limiting on webmin / virtualmin.
And one more thing. Since we are hosting about 20-30 GB of mails on this server, it is possible that after we moved, all our employees from the office downloaded the IMAP folders. Obviously all downloads came from the same office IP.
I would really appreciate some help here.
So, basically my entire Virtualmin server is very very fast from certain locations and it slows down to 3-4 kb / sec per download on various other locations. I tested it via tens of VPNs from all around the world and I have issues on at least 70-80% of locations I used, the rest of 20-30% were extremely fast.
Check this picture for example: http://www.tradeholding.com/luxury.jpg
It is a 4 MB file and if you have luck, it will download in max 1-2 seconds! If not, you will see the picture is slowly downloading before Apache times out.
When I try to download the same image to my PC via an SCP client it doesn’t stop but it is downloading with 3-4 kb / sec.
Uploading seems to be fine from every location I tested, the same 4 MB file is uploaded in max 1-2 secs.
What can be on Virtualmin / Webmin that is limiting my download speed?
Luxury.jpg downloads instantly here, South East US. And within a few seconds over tor network via Europe. Nothing in webmin/virtualmin will limit bandwidth per ip.
Start a download and run a trace route to see if/where packet loss or high ping is occurring. Has to be something going on along the route.
You can see on hop 18 a 90% packet loss. I ran the same test several times, and there is always a 90% packet loss at that hop. I sent this info to the dedicated company and got this response:
“Ping loss that doesn’t continue onward is not actual loss, rather it is a hop not responding to those packets in favor of processing actual traffic packets instead. As the 90% loss does not continue forward, it does not appear there is actual loss.”
I am not an expert here, but can this be the main issue?