Originally Posted by Bullshot

I'm having a "constant lag and then disconnect" issue since the 10th of September and I'm hoping someone here may have an idea what might be wrong. I've already made a thread on the Blizzard Tech Support forum and there are a lot of other players who are experiencing the same issue, but none of the ideas posted in those threads has helped ("Lagging" forever - Forums - World of Warcraft and Constant Disconnections. - Forums - World of Warcraft).

What happens is that once I log in, I can stay without lag for around 5-10 seconds on most occasions and 60 seconds very rarely. After that, every other player starts "moonwalking" and patrolling NPCs stop dead in their tracks. My pet doesn't move with me and none of my actions register. After a while, I'll get disconnected. Sometimes this happens immediately upon logging in and everyone's name appears as "Unknown". I've gone through all the stickies on the Tech Support forum and the common solutions to the "Unknown Entities and Lag" problem, but nothing has helped.

Here's a list of the options I've explored to try and fix this:
- Remove WTF, Cache, Interface and Data\Cache folders and log in.
- Update all drivers, including network card, video card, audio card.
- Toggle the Optimize Network for Speed option in WoW.
- Run the Repair tool but that only checks 53MB of data and reports that there were no problems found. When I made a post about it on the Blizzard Tech Support forum, a Blizzard representative said that that's working as intended and the Repair tool only checks some critical data now and the Launcher has a repair-on-demand feature that fixes any data corruption. The Launcher didn't report any problems with the installation.
- Change the Network Card settings as per this article (Blizzard Support) and disable all Checksum Offloading, Priority & VLAN, Large Send Offload, Receive Side Scaling. Also disabled the Power Management options for the network card.
- Make sure all ports are forwarded in the router/modem and make sure that a static internal IP has been created.
- Check for malware using Malwarebytes Anti-Malware, spyware with Windows Defender, virii with ESET NOD32.
- Reduce the MTU to 1400.
- Open Command Prompt in Administrator Mode and do the following changes:
1. Disable Receive Side Scaling State by typing netsh int tcp set global rss=disabled
2. Disable Compound TCP by typing netsh int tcp set global congestionprovider=none
3. Disable ECN by typing netsh int tcp set global ecncapability=disabled
- Re-download the entire client from scratch on a different drive.
- Format C:\ and re-install Windows.

None of these options have helped and I'm at a loss to figure out what the problem might be. I normally use the Lowerping service as well and initially thought it might be related to that, but this problem occurs regardless of whether I connect to the game using Lowerping or not. I even uninstalled Lowerping from the system but that didn't help either. Any ideas about a possible solution, no matter how "out there" it might seem? This lag and disconnect only happens with WoW and since I've re-formatted and re-installed everything, I'm at a loss on what could be wrong.

EDIT: After all the options that I tried, today's server maintenance fixed this problem. So guess it was something on the server-side related to the communication between server and client.