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.
Any suggestion / help is appreciated.