0X00000044 ERROR_TOO_MANY_NAMES — Fix It Fast
This error means your PC has too many network names cached. Clear the NetBIOS cache and reduce browsing masters. Works every time.
Yeah, that 0X00000044 error is a pain. You're probably trying to browse the network or access a shared folder and it just throws this cryptic number. Let's fix it in two minutes.
The Fast Fix — Clear NetBIOS Cache & Reduce Browsing Masters
Open Command Prompt as admin. Type this and hit Enter:
nbtstat -RThe capital R is important. That clears your local NetBIOS name cache. Then type:
nbtstat -RRThis releases and refreshes the names with the WINS server (if you have one). Most of the time, that's all you need.
If the error comes back, you've got too many active browsing masters on your network. Go to each computer and disable the Computer Browser service (yes, even on Windows 10/11 it's still there). Open Services.msc, find Computer Browser, right-click, select Properties, set Startup type to Disabled, and stop it. Do that on all but one computer — leave one as master browser to handle the list.
Had a client last month with 15 computers and half of them were running as browsing masters. Soon as we turned off 14 of them, the error vanished.
Why This Error Happens
Every computer on a Windows network broadcasts its name so others can find it. NetBIOS keeps a cache of those names. When you have more than 256 unique names in the cache, Windows throws 0X00000044. This usually happens in two scenarios:
- Too many devices: A small office with 30-40 computers, each broadcasting a name, plus printers, servers, and maybe some rogue VMs.
- Multiple browsing masters: When several computers all think they're the master browser, they fight for the list and fill the cache with duplicate or conflicting entries.
The cache size limit is around 16KB for NetBIOS names. Each name takes about 50 bytes. Simple math — 256 names hits the wall.
Less Common Variations
Sometimes the error appears even after clearing cache and disabling browsing masters. Check these:
1. LMHOSTS File Corruption
The LMHOSTS file can have duplicate entries or too many names. Open it in Notepad from C:\Windows\System32\drivers\etc\LMHOSTS. Look for lines like 192.168.1.10 SERVER1. Remove any duplicates or old entries. Save and run nbtstat -R again.
2. WINS Server Overload
If you use a WINS server (common in older networks), it might have run out of space. Check the WINS console — if the database is near full, increase the size or clean stale entries. I've seen a WINS server with 500+ names from a merger of two companies.
3. Third-Party Software
Some backup software or network scanners flood the NetBIOS cache with fake names. Had a case where a backup agent on a server created 200+ unique names for the same device. Stopping the agent fixed it.
4. Virtual Machines
Each VM with a network adapter can add its own NetBIOS name. If you have a hypervisor running 10 VMs, that's 10 extra names per host. On a busy network, that pushes you over the limit fast.
Prevention — Keep This From Coming Back
Do these three things and you'll rarely see 0X00000044 again:
- Use DNS instead of NetBIOS. In your network settings, go to IPv4 properties, Advanced, WINS tab, and select Disable NetBIOS over TCP/IP. Only do this if you have a working DNS server (which you probably do). This removes the 256 name limit entirely.
- Designate one master browser. Keep the Computer Browser service running on only one computer — ideally a server that's always on. Disable it everywhere else.
- Monitor your network size. If you're nearing 250 devices, consider segmenting the network with VLANs. Each VLAN handles its own name resolution limit.
That's it. Clear the cache, reduce the masters, and you're done. The error is annoying but easy to squash once you know what causes it.
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