DropboxInfiniteProxyHelper quit unexpectedly. How can I resolve this?

Hey there, kulath​, let's jump right into this! 

Would you mind trying out an advanced reinstall using these steps, in order to resolve this issue?

Keep me posted, and we'll take it from there!

I'm getting the issue as well & the advanced steps do not work. I did it 3 times..

I even tried going down to Build: Dropbox 223.4.4909
from your offline builds located here: Dropbox Desktop Client Builds | The Dropbox Community
nothing works..

This could only be happening to us, old Mac OS users. Upgrading OS is impossible on my old machine..

Process:               DropboxInfiniteProxyHelper [31284]
Path:                  /Users/USER/Library/Application Support/Dropbox/Dropbox.app/Contents/XPCServices/DropboxInfiniteProxyHelper.xpc/Contents/MacOS/DropboxInfiniteProxyHelper
Identifier:            DropboxInfiniteProxyHelper
Version:               ???
Code Type:             X86-64 (Native)
Parent Process:        ??? [1]
Responsible:           Dropbox [31120]
User ID:               501

Date/Time:             2025-09-06 09:09:08.872 +1000
OS Version:            macOS 11.7.10 (20G1427)
Report Version:        12
Anonymous UUID:        00EB37D9-3FB9-5F56-202B-C7EC09C23E59


Time Awake Since Boot: 150000 seconds

System Integrity Protection: disabled

Crashed Thread:        Unknown

Exception Type:        EXC_CRASH (Code Signature Invalid)
Exception Codes:       0x0000000000000000, 0x0000000000000000
Exception Note:        EXC_CORPSE_NOTIFY

Termination Reason:    Namespace CODESIGNING, Code 0x1

kernel messages:

VM Regions Near 0 (cr2):
--> 
    mapped file                 10598c000-10598f000    [   12K] r-x/r-x SM=COW  Object_id=4685ceff

Backtrace not available

Unknown thread crashed with X86 Thread State (64-bit):
  rax: 0x0000000000000000  rbx: 0x0000000000000000  rcx: 0x0000000000000000  rdx: 0x0000000000000000
  rdi: 0x0000000000000000  rsi: 0x0000000000000000  rbp: 0x0000000000000000  rsp: 0x00007ffeea273b50
   r8: 0x0000000000000000   r9: 0x0000000000000000  r10: 0x0000000000000000  r11: 0x0000000000000000
  r12: 0x0000000000000000  r13: 0x0000000000000000  r14: 0x0000000000000000  r15: 0x0000000000000000
  rip: 0x000000010a788000  rfl: 0x0000000000000200  cr2: 0x0000000000000000
  
Logical CPU:     0
Error Code:      0x00000000
Trap Number:     0

Unknown thread instruction stream not available.

Unknown thread last branch register state not available.


Binary images description not available


External Modification Summary:
  Calls made by other processes targeting this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by all processes on this machine:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0

VM Region Summary:
Writable regions: Total=8400K written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=8400K(100%)
 
                                VIRTUAL   REGION 
REGION TYPE                        SIZE    COUNT (non-coalesced) 
===========                     =======  ======= 
STACK GUARD                       56.0M        1 
Stack                             8192K        1 
VM_ALLOCATE                          8K        2 
VM_ALLOCATE (reserved)             232K        3         reserved VM address space (unallocated)
mapped file                        940K        7 
===========                     =======  ======= 
TOTAL                             65.2M       14 
TOTAL, minus reserved VM space    64.9M       14 

The "make online-only" thing does not work properly; there is no cloud icon, even though it sort of does it & clicking the file once made online it does not open at all. I've tested this with simple text files.

I assume the helper is responsible for making this feature function, which clearly is very broken atm.

even trying to do 

sudo codesign --force --deep --sign - /Applications/Dropbox.app 

Or on the XPC helper does not fix it either..

I'd say this issue only started happening recently. I did a system reboot & then 1-2 days later, I started getting this error.
Not sure if this helps, but I've also switched over to using DoT (DNS over TLS) for DNS on our main router.
But I highly doubt that would cause issues.
I also have AdGuard & Little Snitch, but they have never interfered for the past decade I've used Dropbox with & they haven't had any updates in the past 2-3+ months. Only Dropbox has had updates.

But even with the 5+ old build of Dropbox, I get this "Invalid Signature Crash"

Hey XxUnkn0wnxX - thanks for letting us know about this.

Since this persists after an advanced reinstall, you could try installing the Dropbox desktop app on a new OS profile to see if it works there. If that's not an option at the moment, let us know here and we'll reach out via email to investigate further.

Same goes for you kulath - if the advanced reinstall didn't help you as well, let me know and I'll reach out to you via email too. 

Hi Walter​ , I am actually kulath, but I have had to login with a different name, because when I try to access https://www.dropboxforum.com/, using my kulath​   account I get "We're sorry, but you have been banned from using this site.". I still seem to be able to access the main Dropbox site, and my account details and content there; it is just the forum that I seem to have been banned from.

Could you please unban the kulath account from the forum.

I have tried the advanced instal, but it makes no difference, I still get the error. I checked the certificate, and it seems OK:

$ codesign --display --verbose=4 /Applications/Dropbox.app/Contents/XPCServices/DropboxInfiniteProxyHelper.xpc/Contents/MacOS/DropboxInfiniteProxyHelper
Executable=/Applications/Dropbox.app/Contents/XPCServices/DropboxInfiniteProxyHelper.xpc/Contents/MacOS/DropboxInfiniteProxyHelper
Identifier=com.getdropbox.dropbox.InfiniteProxyHelper
Format=bundle with Mach-O thin (x86_64)
CodeDirectory v=20500 size=534 flags=0x10000(runtime) hashes=7+5 location=embedded
VersionPlatform=1
VersionMin=720896
VersionSDK=984064
Hash type=sha256 size=32
CandidateCDHash sha1=be02b1df540e52746a9531ed43da50f17f9c15b2
CandidateCDHashFull sha1=be02b1df540e52746a9531ed43da50f17f9c15b2
CandidateCDHash sha256=82010fdcaeb6d16f8717056f434e168dc07eb223
CandidateCDHashFull sha256=82010fdcaeb6d16f8717056f434e168dc07eb22360731edffa35e43ddebfe587
Hash choices=sha1,sha256
CMSDigest=fc32cad0b2173c47a989ffd8fcff2679886a90f2c631692fa77099704737236b
CMSDigestType=2
Page size=4096
CDHash=82010fdcaeb6d16f8717056f434e168dc07eb223
Signature size=9148
Authority=Developer ID Application: Dropbox, Inc. (G7HH3F8CAK)
Authority=Developer ID Certification Authority
Authority=Apple Root CA
Timestamp=9 Sep 2025 at 12:23:11
Info.plist entries=21
TeamIdentifier=G7HH3F8CAK
Runtime Version=15.4.0
Sealed Resources version=2 rules=13 files=1
Internal requirements count=1 size=204
$ codesign --verify --verbose /Applications/Dropbox.app/Contents/XPCServices/DropboxInfiniteProxyHelper.xpc/Contents/MacOS/DropboxInfiniteProxyHelper
/Applications/Dropbox.app/Contents/XPCServices/DropboxInfiniteProxyHelper.xpc/Contents/MacOS/DropboxInfiniteProxyHelper: valid on disk
/Applications/Dropbox.app/Contents/XPCServices/DropboxInfiniteProxyHelper.xpc/Contents/MacOS/DropboxInfiniteProxyHelper: satisfies its Designated Requirement

Step 3 of the advanced reinstall says; "When the uninstall finishes, restart your computer.", but this doesn't make much sense, because the only step advised is to move the application to the trash, which happens instantaneously. Was this step intended for when there was an uninstall inside the package, as there is for some applications.

Thanks, would be very grateful for an email contact.

Hey kulath1​, thanks for letting us know about that! 

I was able to successfully unban your account. I sincerely apologize for that, it seems it was a Community moderator error that we managed to fix. 

As for your problem that still persists, I'd be happy to create an email on my end for you. Just let me know which Community-linked email address you'd like for me to use. 

Is it the one under the kulath1​ username, or the one under kulath​? 

Thanks for unbanning me. 
It doesn’t matter which email you use. Try the one under the kukath username. 

I just sent you the email kulath!

Reply back to me, and we'll take it from there. Thanks!