Nextcloud reports error "HealthcheckRequest on check error: cURL error 7

Steps to reproduce

  • installed onlyoffice in docker container locally on nextcloud server;
  • Setup SSL certificates through letsencrypt (letsencrypt running on nextcloud server, copying certificates to docker container through shared volume);
  • Configure apache virtualhost on nextcloud server;
  • Testing setup by connecting to onlyoffice docker from outside (succeeds to HTTPS);
  • connecting onlyoffice to nextcloud by filling in the server’s outside URL in the onlyoffice connector

virtual host portion:
<VirtualHost *:443>

SSLEngine On
SSLProxyEngine On

SSLCertificateChainFile *value removed*
SSLCertificateFile *value removed*
SSLCertificateKeyFile *value removed*

ProxyRequests On
ProxyVia Off
ProxyPreserveHost On

RedirectMatch ^/$ /office
ProxyPass        / https://192.168.XXX.YYY:8443/ nocanon
ProxyPassReverse / https://192.168.XXX.YYY:8443/
ServerName office.*value removed*

RequestHeader set X-Forwarded-Proto "https"
RequestHeader set X-Forwarded-Port "443"

Expected behaviour

Nextcloud will run with onlyoffice integrated

Actual behaviour

Nextcloud reports error “HealthcheckRequest on check error: cURL error 7: Failed to connect to office.xxx.xx port 443: No route to host (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)”

Server configuration detail

Operating system: Linux 4.15.0-88-generic #88-Ubuntu SMP Tue Feb 11 20:11:34 UTC 2020 x86_64

Webserver: Apache (fpm-fcgi)

Database: pgsql PostgreSQL 10.12 (Ubuntu 10.12-0ubuntu0.18.04.1) on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 7.4.0-1ubuntu1~18.04.1) 7.4.0, 64-bit

PHP version:

7.2.24-0ubuntu0.18.04.2
Modules loaded: Core, date, libxml, openssl, pcre, zlib, filter, hash, Reflection, SPL, sodium, session, standard, cgi-fcgi, json, igbinary, apcu, PDO, xml, bz2, calendar, ctype, curl, dom, mbstring, fileinfo, ftp, gd, gettext, gmp, iconv, imagick, imap, intl, redis, ldap, exif, pdo_pgsql, pgsql, Phar, posix, readline, shmop, SimpleXML, smbclient, soap, sockets, sysvmsg, sysvsem, sysvshm, tokenizer, wddx, xmlreader, xmlwriter, xsl, zip, libsmbclient, Zend OPcache

Nextcloud version: 18.0.1 - 18.0.1.3

Updated from an older Nextcloud/ownCloud or fresh install: updated from 18.0 (18.0 was fresh install)

Where did you install Nextcloud from: Virtual machine (Hanssonit.se version)

Signing status

Array
(
)

List of activated apps
Enabled:
 - activity: 2.11.0
 - admin_audit: 1.8.0
 - calendar: 2.0.2
 - cloud_federation_api: 1.1.0
 - comments: 1.8.0
 - contacts: 3.2.0
 - dav: 1.14.0
 - deck: 0.8.0
 - dropit: 0.3.0
 - extract: 1.2.3
 - federatedfilesharing: 1.8.0
 - files: 1.13.1
 - files_antivirus: 2.2.1
 - files_automatedtagging: 1.8.0
 - files_external: 1.9.0
 - files_pdfviewer: 1.7.0
 - files_rightclick: 0.15.2
 - files_sharing: 1.10.1
 - files_versions: 1.11.0
 - files_videoplayer: 1.7.0
 - firstrunwizard: 2.7.0
 - groupfolders: 6.0.1
 - issuetemplate: 0.6.0
 - logreader: 2.3.0
 - lookup_server_connector: 1.6.0
 - maps: 0.1.5
 - nextcloud_announcements: 1.7.0
 - notes: 3.1.5
 - notifications: 2.6.0
 - oauth2: 1.6.0
 - onlyoffice: 4.1.4
 - password_policy: 1.8.0
 - photos: 1.0.0
 - previewgenerator: 2.2.0
 - privacy: 1.2.0
 - provisioning_api: 1.8.0
 - ransomware_protection: 1.6.0
 - recommendations: 0.6.0
 - settings: 1.0.0
 - sharebymail: 1.8.0
 - spreed: 8.0.5
 - support: 1.1.0
 - survey_client: 1.6.0
 - systemtags: 1.8.0
 - tasks: 0.11.3
 - text: 2.0.0
 - theming: 1.9.0
 - twofactor_backupcodes: 1.7.0
 - updatenotification: 1.8.0
 - viewer: 1.2.0
 - workflowengine: 2.0.0
Disabled:
 - accessibility
 - encryption
 - federation
 - files_trashbin
 - gpxedit
 - mail
 - serverinfo
 - user_ldap

Configuration (config/config.php)
{
    "passwordsalt": "***REMOVED SENSITIVE VALUE***",
    "secret": "***REMOVED SENSITIVE VALUE***",
    "trusted_domains": [
        "localhost",
        "192.168.178.*",
        "trd106.nl",
        "trd106.nl"
    ],
    "datadirectory": "***REMOVED SENSITIVE VALUE***",
    "dbtype": "pgsql",
    "version": "18.0.1.3",
    "overwrite.cli.url": "https:\/\/trd106.nl\/",
    "dbname": "***REMOVED SENSITIVE VALUE***",
    "dbhost": "***REMOVED SENSITIVE VALUE***",
    "dbport": "",
    "dbtableprefix": "oc_",
    "dbuser": "***REMOVED SENSITIVE VALUE***",
    "dbpassword": "***REMOVED SENSITIVE VALUE***",
    "installed": true,
    "instanceid": "***REMOVED SENSITIVE VALUE***",
    "log_type": "file",
    "logfile": "\/var\/log\/nextcloud\/nextcloud.log",
    "loglevel": "0",
    "mail_smtpmode": "smtp",
    "remember_login_cookie_lifetime": "7200",
    "log_rotate_size": "10485760",
    "trashbin_retention_obligation": "auto, 180",
    "versions_retention_obligation": "auto, 365",
    "simpleSignUpLink.shown": "false",
    "memcache.local": "\\OC\\Memcache\\APCu",
    "filelocking.enabled": true,
    "memcache.distributed": "\\OC\\Memcache\\Redis",
    "memcache.locking": "\\OC\\Memcache\\Redis",
    "redis": {
        "host": "***REMOVED SENSITIVE VALUE***",
        "port": 0,
        "timeout": 0.5,
        "dbindex": 0,
        "password": "***REMOVED SENSITIVE VALUE***"
    },
    "logtimezone": "Europe\/Amsterdam",
    "htaccess.RewriteBase": "\/",
    "enable_previews": true,
    "enabledPreviewProviders": {
        "11": "OC\\Preview\\PNG",
        "12": "OC\\Preview\\JPEG",
        "13": "OC\\Preview\\GIF",
        "14": "OC\\Preview\\BMP",
        "15": "OC\\Preview\\MarkDown",
        "16": "OC\\Preview\\MP3",
        "17": "OC\\Preview\\TXT",
        "18": "OC\\Preview\\Movie"
    },
    "preview_max_x": "2048",
    "preview_max_y": "2048",
    "jpeg_quality": "60",
    "maintenance": false,
    "mail_smtpsecure": "ssl",
    "mail_sendmailmode": "smtp",
    "mail_from_address": "***REMOVED SENSITIVE VALUE***",
    "mail_domain": "***REMOVED SENSITIVE VALUE***",
    "mail_smtpauthtype": "LOGIN",
    "mail_smtpauth": 1,
    "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
    "mail_smtpport": "465",
    "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
    "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
    "app_install_overwrite": [
        "gpxedit",
        "dropit"
    ],
    "theme": ""
}

Are you using external storage, if yes which one: smb

Are you using encryption:

Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/…

Client configuration

Browser: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36

Operating system:

Logs

Web server error log
[Mon Mar 09 06:25:06.050906 2020] [http2:warn] [pid 26641] AH10034: The mpm module (prefork.c) is not supported by mod_http2. The mpm determines how things are processed in your server. HTTP/2 has more demands in this regard and the currently selected mpm will just not do. This is an advisory warning. Your server will continue to work, but the HTTP/2 protocol will be inactive.
[Mon Mar 09 06:25:06.086941 2020] [mpm_prefork:notice] [pid 26641] AH00163: Apache/2.4.29 (Ubuntu) OpenSSL/1.1.1d configured -- resuming normal operations
[Mon Mar 09 06:25:06.086956 2020] [core:notice] [pid 26641] AH00094: Command line: '/usr/sbin/apache2'
Nextcloud log
Nextcloud reports error "HealthcheckRequest on check error: cURL error 7: Failed to connect to office.trd106.nl port 443: No route to host (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)"
Browser log

After investigating broader found the answer.

After running a traceroute on the nextcloud host to the office.XXX.XX DNS name found out it returned a wrong IP adress.
Turned out there was a line in /etc/hosts from previous attempts to get onlyoffice running. Removing the line there solved the issue for me.