What you’re seeing
- The domain controller's CPU sits near 100% with the Local Security Authority process using most of it.
- Logons, Group Policy processing and password changes become slow across the office.
- Applications that look up users or groups time out intermittently.
- The spikes come and go, sometimes on a schedule, without an obvious cause.
- Adding more memory or rebooting helps briefly before the load returns.
Common causes
Every environment is different, but these are the causes our engineers find most often:
- An application runs inefficient LDAP queries, such as unindexed searches across the entire directory, repeatedly.
- A misconfigured service, printer or appliance retries failed binds in a tight loop.
- A sync, backup or identity tool polls Active Directory far more often than needed.
- Many clients are hard-coded to a single domain controller instead of spreading load across all of them.
- A compromised device or reconnaissance tool is enumerating the directory, which looks like heavy LDAP traffic.
Why it matters
Every sign-in, file share access and many application requests depend on domain controllers responding quickly. When one is overwhelmed, the whole office slows down even though nothing appears broken. The effect is wider in organizations with only one or two DCs. Heavy, unexplained directory queries also deserve a security look, since attackers often map Active Directory this way before moving through a network. Identifying the source protects both performance and security.
How AskTechGurus fixes it
Skip the trial and error. A certified engineer works on your actual system, finds the root cause, and fixes it properly.
Tell us what’s happening
Submit a ticket in about two minutes. Paste the error, describe what changed, and pick your tier. No charge to submit.
A certified engineer diagnoses it
A vetted, US-based systems engineer claims your ticket, usually within minutes during business hours, and investigates over a secure remote session you can watch and end at any time.
Fixed and verified with you
The engineer resolves the root cause and confirms with you that it’s working. You don’t just get a workaround, and you get a plain-English summary of what was wrong.
Pay only when it’s resolved
Fixed price from $99, invoiced only after you approve the fix. If it isn’t resolved, you don’t pay.
Frequently asked questions
Do we need a bigger server?
Usually not. In most cases a specific application or device is generating the load, and addressing it is cheaper and more effective than new hardware.
Could this be an attack?
It can be. Directory enumeration by malicious tools looks similar to heavy application traffic, so we identify the source before ruling it out.