There is many aspects that may cause possible packet loss but mostly experienced among Customers is using single DNS configuration to resolve host names.
Often happens that to connect to the server instead of clean IP address a hostnames assigned to the server IP is used. In that case it is worth to make sure that the network adapter configuration is based on at least two (2) DNSes.
Very often VPS/Dedicated server vendor provide machines with a single DNS configured. How to proceed to add secondary DNS?
- In Control Panel open Network and Sharing Center, on the left click Change Adapter settings
- Right click on network connection adapter that is used and select properties
- Left Click on Internet Protocol Version 4 (TCP/IPv4) and click properties below
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In the bottom part of new window a Preferred DNS Server and Alternative DNS Server should be visible, if the alternative one is empty fill it out with the following
- 8.8.8.8
- If necessary the preferred DNS can be switched to Google's one, however, if not having a reason to do it it is better to leave the preferred as shipped by the service vendor as their own DNS Server may be used to handle server machine service - good example is here OVH. If decided to change them both then set preferred to 8.8.8.8 and alternative to 8.8.4.4
EXTRA STEP: If not used then IPv6 can be disabled to close possible way to attack the server. To do that return to window of step 2 (described above) and on the list uncheck Internet Protocol Version 6 (TCP/IPv6)