nsurlsessiond on iPhone: What It Is and How to Fix It

You opened Battery settings looking for the reason your iPhone is dying faster than usual. You found a process called nsurlsessiond. Now you want to know what it is and whether you can stop it.

This guide covers both.

What is nsurlsessiond?

nsurlsessiond is a background system daemon built into iOS. The name comes from NSURLSession, which is Apple’s framework for handling network requests over HTTP and HTTPS. The d suffix means daemon, which in Unix and Apple’s systems means a process that runs silently in the background.

It isn’t an app. You won’t find it in the App Store or see it listed under your installed apps. It’s a shared infrastructure component that other apps use when they need to download or upload data while running in the background.

When your email app checks for new messages while you’re not using it, that network request often goes through nsurlsessiond. Same for a news app pulling in the latest articles, or a podcast client downloading your next episode. The process acts as a centralised handler for background network activity across iOS.

Apple designed it this way deliberately. Rather than each app managing its own background networking, which would be harder to control and harder to battery-optimise, iOS routes that traffic through a shared daemon it can throttle and schedule.

Is nsurlsessiond safe?

Yes, completely. It’s a legitimate Apple system process that has been part of iOS for well over a decade.

If you see it in your battery stats, you don’t have malware. You don’t have a compromised phone. Something is simply making more use of background networking than expected, and nsurlsessiond is where that shows up.

Why it drains battery

A process that handles all background network traffic will show up in battery stats whenever that traffic is heavy. Several things cause it to run more than usual.

Too many apps using Background App Refresh. Every app with Background App Refresh enabled can wake nsurlsessiond to do its downloading. If you have 30 apps with it on, that’s 30 potential sources of background activity all funnelling through the same process. The cumulative effect adds up.

A stuck or looping background task. Some apps get into states where they keep retrying a network request that keeps failing, usually because of a connectivity issue or a bug on the app’s server. nsurlsessiond runs repeatedly trying to complete the task and never succeeds. This kind of loop can hold a significant drain for hours.

iCloud syncing after a change. Restoring from a backup, adding a large photo library, upgrading to a new iPhone, or even just enabling a new iCloud service triggers initial syncing that runs through nsurlsessiond. It can stay elevated for an hour or two, sometimes longer.

A poorly optimised third-party app. Some apps make far more background network requests than they need to. A misbehaving social media app, for example, might refresh every few minutes even when you’re not near it.

The first 24 to 48 hours after an iOS update. iOS does re-indexing, cache rebuilding, and syncing work after major updates. Battery drain from background processes including nsurlsessiond is higher than normal during this window and usually settles on its own.

How to find which app is responsible

iOS doesn’t directly attribute nsurlsessiond activity to a specific app in the battery breakdown. There’s no label that says “nsurlsessiond was run by Instagram.” You have to narrow it down.

Go to Settings > Battery and look at the list with background time shown. Any app showing a large ratio of background time to foreground time, especially over the last 24 hours, is a candidate. Social media apps, news aggregators, and email clients are the usual suspects.

You can also check Settings > Privacy & Security > Analytics & Improvements > Analytics Data. The logs there sometimes show which apps triggered repeated background tasks, though the format is developer-oriented and takes patience to read.

The practical approach is to disable Background App Refresh for suspected apps one at a time and monitor battery life over the next few hours.

Fixes, in order

Work through these from least to most disruptive. Most people find the answer in steps one through four.

1. Restart your iPhone

A restart clears stuck background tasks. If nsurlsessiond is in a retry loop, restarting the phone breaks it immediately. Give things an hour after restarting before checking whether battery drain has improved.

2. Wait after an iOS update

If the elevated drain started within a day or two of an update, leave it alone for 48 hours. The post-update indexing and syncing work will complete, and battery usage will return to normal. Checking battery stats during this period is misleading because you’re seeing temporary setup activity, not steady-state behaviour.

3. Turn off Background App Refresh for aggressive apps

Settings > General > Background App Refresh.

You can disable it entirely with the top toggle, or go through app by app. Social media apps are the biggest contributors: Facebook, Instagram, X, Reddit, TikTok, Snapchat. Most people don’t notice a difference when these are off because the apps still deliver push notifications; they just don’t pre-load your feed while you’re away.

Email apps are worth checking too. If your email client supports push notifications, you can turn off Background App Refresh for it without missing messages. The inbox just won’t be pre-loaded when you open the app.

4. Check iCloud syncing

Settings > your name > iCloud. Look at which services are active. If you recently enabled iCloud Photos or switched from a photo service, the initial upload can take a long time and puts consistent load on nsurlsessiond.

Connecting to Wi-Fi and leaving the phone on charge overnight gives iCloud the chance to finish without draining your battery during the day.

5. Delete and reinstall the suspected app

If you’ve identified a specific app that seems to be the cause, delete it completely and reinstall from the App Store. Fresh installs clear local caches and reset any stuck background tasks associated with that app.

6. Reset network settings

Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings.

This clears Wi-Fi passwords, cellular settings, and VPN configurations, then re-establishes the system’s background network state from scratch. You’ll need to reconnect to saved Wi-Fi networks afterward, so have passwords handy. It’s effective at clearing persistent issues that restarts don’t fix.

7. Update iOS

Go to Settings > General > Software Update and install any available update. Apple patches background process behaviour regularly, and some iOS versions have had bugs where specific apps or system services caused nsurlsessiond to run far more than intended. The fix was in a subsequent update.

8. Check VPN and MDM configuration

A VPN running continuously adds an extra processing layer to every network request. Try disabling the VPN for a few hours to see whether battery drain drops.

If your phone is managed by an employer or school through a Mobile Device Management profile, background network activity can be elevated by policies outside your control. Talk to your IT team if you suspect this is the cause.

When the problem isn’t nsurlsessiond

If you’ve worked through the fixes above and battery life is still short, the root cause may not be a background process. Check Settings > Battery > Battery Health & Charging. A battery below 80% capacity will drain faster than the phone’s software expects, and no amount of process tweaking will fully compensate for that.

For other iOS background processes that show up unexpectedly in battery stats, see the guides on what DASDelegateService is on iPhone, rapportd high CPU usage and how to fix it, and iPhone system services draining battery overnight. The diagnostic approach is the same across all of them.

For a broader comparison of how iOS and Android handle background battery management differently, the Android vs iOS battery management guide covers the structural differences between the two platforms.

Frequently asked questions

Can I turn off nsurlsessiond?

No. It’s a system daemon that iOS manages directly. You can reduce how often it runs by limiting Background App Refresh and iCloud services, but you can’t disable the process itself without jailbreaking, which Apple doesn’t support.

Does nsurlsessiond use cellular data?

Yes, unless restricted. Go to Settings > Cellular and scroll to the app list. Disabling cellular for apps you only want to sync on Wi-Fi reduces both data usage and background battery drain, since cellular radio use is more power-intensive than Wi-Fi.

Is nsurlsessiond related to malware?

No. It’s a native iOS component that predates most current malware by years. Malware on iOS typically requires a jailbroken device to gain system-level access, and it would show up differently in diagnostics.

Why does it appear even when I’m not using my phone?

That’s its intended purpose. It runs specifically when the screen is off and apps need to do background work, so content is ready when you open them. The problem is when it runs more than is necessary, usually because of too many apps with Background App Refresh on or a stuck task.

Will a factory reset fix nsurlsessiond battery drain?

A factory restore resets everything back to a clean state, which clears any stuck processes or misbehaving app configurations. But it’s a significant step. Work through disabling Background App Refresh, checking iCloud, and reinstalling suspected apps first. Most cases resolve without resetting.

nsurlsessiond says it was active for longer than my screen-on time. Is that normal?

Yes. Background time accumulates separately from screen-on time, and nsurlsessiond runs specifically when your screen is off. Seeing a high background time number isn’t unusual for this process. What matters is whether the battery percentage is dropping faster than you expect.