The stream or file (log file) could not be opened in append mode: Failed to open stream: Permission denied

[gregcorwin]

I uploaded my cms files and I am getting the following errors

2026-01-20T19:21:51+00:00 [info] User Deprecated: Since symfony/framework-bundle 7.3: Not setting the "property_info.with_constructor_extractor" option explicitly is deprecated because its default value will change in version 8.0.

2026-01-20T19:21:51+00:00 [info] User Deprecated: Since symfony/dependency-injection 7.4: Service id "PHPMaker2026\KgcrFv1\SystemTimeProvider" looks like a FQCN but no corresponding class or interface exists. To resolve this ambiguity, please rename this service to a non-FQCN (e.g. using dots), or create the missing class or interface.

2026-01-20T19:21:51+00:00 [info] User Deprecated: Since symfony/framework-bundle 7.3: Not setting the "property_info.with_constructor_extractor" option explicitly is deprecated because its default value will change in version 8.0.

2026-01-20T19:21:51+00:00 [critical] Uncaught Exception: The stream or file "D:\**redacted**\cms\var\log/prod-nested.log" could not be opened in append mode: Failed to open stream: Permission denied
The exception occurred while attempting to log: Error warming up language "en-US": Warning: file_put_contents(D:/**redacted**E/cms/translations/messages.en_US.php): Failed to open stream: Permission denied
Context: {"exception":{}}

I have cleared the var/cache/ folder but I am not sure what else to do. I did click
”Environment > production” on the last “generate”

TIA

[arbei]

Make sure you have configured write permissions for your project folder properly, read Migrating to v2026 -> Write Permissions.

In addition, make the web server user has write permissions to the <ProjectFolder>\translations folder.

[gregcorwin]

I am still have (intermittent) 500 errors. I added write permission on the assets and translation folders, then deleted everything in the var folder. On the server I can sometimes log in, and sometimes not. clearing the var folder helps, but I shouldn’t have to do that everytime someone logs in. I still can’t get to it consistently from a browser that is not on the server

but now I only get this (on the server and remotely)

after some more testing and poking around I think it might have something to do with the login.

When I get the error the URL is

https://www.ourdomain.com/cms/login but if I remove the “login” portion then the CMS works and forwards to the default table.

Weird. any suggestions?

TIA - Greg

[arbei]

1. When you see 500, always enable Debugging and check the detailed error message.
2. If no login page, your project might not enable security, or is with wrong security settings.

[gregcorwin]

OK I enabled debugging, regenerated the files, uploaded everything to the server. I went into the cms/var/prod/ and deleted everything. I then went to the cms in a browser and got this

2026-01-22T13:56:15+00:00 [critical] Uncaught Exception: The stream or file "D:\REDACTED\cms\var\log/deprecations.log" could not be opened in append mode: Failed to open stream: Permission denied
The exception occurred while attempting to log: User Deprecated: Since symfony/framework-bundle 7.3: Not setting the "property_info.with_constructor_extractor" option explicitly is deprecated because its default value will change in version 8.0.
Context: {"exception":{}}

totally broken now.

And I want to be clear about the login thing. When it was (kinda) working, I was able to get to the login form, enter credentials, but when the form was submitted I got the 500 on this URL

https://wwww.ourdomain.com/cms/login

but removing the login folder name login to get to

https://wwww.ourdomain.com/cms/ allowed the cms to redirect to the default folder

https://wwww.ourdomain.com/cms/defaultfolder

there is something wonky with the redirect, not the setup of the security settings which are

[arbei]

1. You need to enable write permissions for the cache and log folders, as mentioned, read Migrating to v2026 -> Write permissions.
2. When a critical error occurs, the script stops and hence no redirection.

[gregcorwin]

Except I have full permissions for the IUSR on the var directory,

and there are a partial number of files that I deleted that were generated, e.g.

and

[arbei]

1. Your web server issue may not be IUSR, read Configuring Read/Write Permissions for Temp Folders.
2. If your project folder is controlled by other software (e.g. you sync the folder by OneDrive or other similar), the permissions might be controlled by it, you better try to use a project folder outside such folders.