Hello guys,
The Basics
- Nextcloud Server version (e.g., 29.x.x):
31.0.2
- Operating system and version (e.g., Ubuntu 24.04):
Debian 12.1
- Web server and version (e.g, Apache 2.4.25):
Apache2
- PHP version (e.g, 8.3):
8.3.2
- Is this the first time you’ve seen this error? (Yes / No):
Yes
- When did this problem seem to first start?
When configuring protonmail account
- Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
Docker image (nextcloud:31.0.2 )
- Are you using CloudfIare, mod_security, or similar? (Yes / No)
no
Summary of the issue you are facing:
I’m trying to configure a protonmail account within the NC mail app. But i can’t get it to work.
My Nextcloud instance is in a docker container and is working fine overall.
I have another container on my server where Proton Bridge is installed. I logged in the Proton Bridge and it is working well (i configured Thunderbird on my phone with the Proton Bridge data and it works perfectly).
The name of that container is Proton-Bridge
But on the Nextcloud mail app, i can’t get to configure the protonmail account.
After entering all the info (in the manual conf tab) like this :
imap
Host : proton-bridge (without capital because Docker normalize)
imap security : none
Port : 143
user : my email
password : the password given by proton bridge
smtp
Host : proton-bridge (without capital because Docker normalize)
smtp security : none
Port : 25
user : my email
password : the password given by proton bridge
I’ve tried many different configurations in those settings but always when i click on “connect” i got that error saying : “IMAP server not reachable”.
I confirm that both Proton Bridge container and Nextcloud container are connected to the same docker Network.
So i captured a log of what happened when clicking that connect button and here is what i got so far :
Log entries
Nextcloud
{
"reqId": "hWvlfFYVnVzqb4vkBob2",
"level": 2,
"time": "2025-04-29T08:37:00+00:00",
"remoteAddr": "192.168.1.10",
"user": "Matthieu",
"app": "no app in context",
"method": "POST",
"url": "/apps/mail/api/accounts",
"message": "Host protonmail-bridge was not connected to because it violates local access rules",
"userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128.0) Gecko/20100101 Firefox/128.0",
"version": "31.0.2.1",
"data": []
}
Configuration
Nextcloud
{
"system": {
"instanceid": "***REMOVED SENSITIVE VALUE***",
"passwordsalt": "***REMOVED SENSITIVE VALUE***",
"secret": "***REMOVED SENSITIVE VALUE***",
"installed": true,
"maintenance": false,
"maintenance_window_start": "3",
"maintenance_window_end": "5",
"version": "31.0.2.1",
"trusted_domains": [
"192.168.1.2",
"localhost"
],
"htaccess.RewriteBase": "\/",
"overwrite.cli.url": "http:\/\/192.168.1.2:8080",
"dbtype": "pgsql",
"dbname": "***REMOVED SENSITIVE VALUE***",
"dbhost": "***REMOVED SENSITIVE VALUE***",
"dbport": "",
"dbtableprefix": "oc_",
"dbuser": "***REMOVED SENSITIVE VALUE***",
"dbpassword": "***REMOVED SENSITIVE VALUE***",
"datadirectory": "***REMOVED SENSITIVE VALUE***",
"apps_paths": [
{
"path": "\/var\/www\/html\/apps",
"url": "\/apps",
"writable": false
},
{
"path": "\/var\/www\/html\/custom_apps",
"url": "\/custom_apps",
"writable": true
}
],
"memcache.local": "\\OC\\Memcache\\APCu",
"memcache.locking": "\\OC\\Memcache\\APCu",
"preview_concurrency_all": 2,
"preview_concurrency_new": 2,
"session.encrypt": false,
"loglevel": 0,
"debug": true,
"mail_smtpmode": "smtp",
"mail_smtpstreamoptions": {
"ssl": {
"allow_self_signed": true,
"verify_peer": false,
"verify_peer_name": false
}
},
"mail_imapstreamoptions": {
"ssl": {
"allow_self_signed": true,
"verify_peer": false,
"verify_peer_name": false
}
},
"connectivity": {
"allow_local_address": true,
"allow_local_remote_servers": [
"172.23.0.2"
],
"check_local_address": false,
"allow_untrusted_certificate": true
},
"app_install_overwrite": [
"occweb"
],
"upgrade.disable-web": true,
"memories.db.triggers.fcu": true,
"memories.exiftool": "\/var\/www\/html\/custom_apps\/memories\/bin-ext\/exiftool-amd64-glibc",
"memories.vod.path": "\/var\/www\/html\/custom_apps\/memories\/bin-ext\/go-vod-amd64",
"default_phone_region": "FR"
}
}
Apps
Enabled:
- activity: 4.0.0
- app_api: 5.0.2
- bruteforcesettings: 4.0.0
- calendar: 5.2.2
- circles: 31.0.0
- cloud_federation_api: 1.14.0
- comments: 1.21.0
- contacts: 7.0.6
- contactsinteraction: 1.12.0
- cospend: 3.0.11
- dashboard: 7.11.0
- dav: 1.33.0
- deck: 1.15.0
- federatedfilesharing: 1.21.0
- federation: 1.21.0
- files: 2.3.1
- files_downloadlimit: 4.0.0
- files_pdfviewer: 4.0.0
- files_reminders: 1.4.0
- files_sharing: 1.23.1
- files_trashbin: 1.21.0
- files_versions: 1.24.0
- firstrunwizard: 4.0.0
- logreader: 4.0.0
- lookup_server_connector: 1.19.0
- mail: 5.0.2
- nextcloud_announcements: 3.0.0
- notes: 4.12.0
- notifications: 4.0.0
- oauth2: 1.19.1
- password_policy: 3.0.0
- photos: 4.0.0-dev.1
- privacy: 3.0.0
- profile: 1.0.0
- provisioning_api: 1.21.0
- recommendations: 4.0.0
- related_resources: 2.0.0
- richdocuments: 8.6.4
- richdocumentscode: 24.4.1303
- serverinfo: 3.0.0
- settings: 1.14.0
- sharebymail: 1.21.0
- support: 3.0.0
- survey_client: 3.0.0
- systemtags: 1.21.1
- text: 5.0.0
- theming: 2.6.1
- twofactor_backupcodes: 1.20.0
- updatenotification: 1.21.0
- user_status: 1.11.0
- viewer: 4.0.0
- weather_status: 1.11.0
- webhook_listeners: 1.2.0
- workflowengine: 2.13.0
Disabled:
- admin_audit: 1.21.0
- encryption: 2.19.0
- files_external: 1.23.0
- memories: 7.5.2 (installed 7.5.2)
- suspicious_login: 9.0.1
- twofactor_nextcloud_notification: 5.0.0
- twofactor_totp: 13.0.0-dev.0
- user_ldap: 1.22.0.
Thanks for your answer and do not hesitate to ask me if you need further informations 