URL working from Grafana server but not from data source

Hi all,

I am trying to integrate NagiosXI via PNP.
The pnp4nagios works well and is even reachable from the grafana server (with and without proxy).

Ex:

[root@am1-sha-grafana-p grafana]# curl -v http://10.193.8.55/pnp4nagios
* About to connect() to 10.193.8.55 port 80 (#0)
*   Trying 10.193.8.55... connected
* Connected to 10.193.8.55 (10.193.8.55) port 80 (#0)
> GET /pnp4nagios HTTP/1.1
> User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.44 zlib/1.2.3 libidn/1.18 libssh2/1.4.2
> Host: 10.193.8.55
> Accept: */*
>
< HTTP/1.1 301 Moved Permanently
< Date: Wed, 21 Jul 2021 10:14:37 GMT
< Server: Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips PHP/5.4.16
< Location: http://10.193.8.55/pnp4nagios/
< Content-Length: 238
< Content-Type: text/html; charset=iso-8859-1
<
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>301 Moved Permanently</title>
</head><body>
<h1>Moved Permanently</h1>
<p>The document has moved <a href="http://10.193.8.55/pnp4nagios/">here</a>.</p>
</body></html>
* Connection #0 to host 10.193.8.55 left intact
* Closing connection #0

[root@am1-sha-grafana-p grafana]# wget --no-proxy http://10.193.8.55/pnp4nagios/
--2021-07-21 12:15:41--  http://10.193.8.55/pnp4nagios/
Connecting to 10.193.8.55:80... connected.
HTTP request sent, awaiting response... 302 Found
Location: http://10.193.8.55/pnp4nagios/graph [following]
--2021-07-21 12:15:42--  http://10.193.8.55/pnp4nagios/graph
Reusing existing connection to 10.193.8.55:80.
HTTP request sent, awaiting response... 302 Found
Location: http://10.193.8.55/pnp4nagios/graph?host=0_SIM_KPI01_Data_Home_Services_Availability [following]
--2021-07-21 12:15:42--  http://10.193.8.55/pnp4nagios/graph?host=0_SIM_KPI01_Data_Home_Services_Availability
Reusing existing connection to 10.193.8.55:80.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [text/html]
Saving to: “index.html.4”

    [  <=>                                                                                                                                                          ] 58,675       150K/s   in 0.4s

2021-07-21 12:15:42 (150 KB/s) - “index.html.4” saved [58675]

However, when adding it as a PNP Datasource I end up with “HTTP Error Gateway Timeout

The logs did not show anything to understand this problem. (I even tried changing the log levels). What I cannot understand is why this URL is reachable and working while from the data source it fails.

The Grafana version is “v6.1.6 (commit: cf9cb45)”

Here’s below the ini file for your perusal.

##################### Grafana Configuration Defaults #####################
#
# Do not modify this file in grafana installs
#

# possible values : production, development
app_mode = production

# instance name, defaults to HOSTNAME environment variable value or hostname if HOSTNAME var is empty
instance_name = ${HOSTNAME}

#################################### Paths ###############################
[paths]
# Path to where grafana can store temp files, sessions, and the sqlite3 db (if that is used)
data = /var/lib/grafana

# Temporary files in `data` directory older than given duration will be removed
temp_data_lifetime = 24h

# Directory where grafana can store logs
logs = /var/log/grafana

# Directory where grafana will automatically scan and look for plugins
plugins = /var/lib/grafana/plugins

# folder that contains provisioning config files that grafana will apply on startup and while running.
provisioning = conf/provisioning

#################################### Server ##############################
[server]
# Protocol (http, https, socket)
protocol = http

# The ip address to bind to, empty will bind to all interfaces
http_addr =

# The http port to use
http_port = 3000

# The public facing domain name used to access grafana from a browser
#domain = localhost
domain = 10.192.254.17

# Redirect to correct domain if host header does not match domain
# Prevents DNS rebinding attacks
enforce_domain = false

# The full public facing url
root_url = %(protocol)s://%(domain)s:%(http_port)s/

# Log web requests
router_logging = false

# the path relative working path
static_root_path = public

# enable gzip
enable_gzip = false

# https certs & key file
cert_file =
cert_key =

# Unix socket path
socket = /tmp/grafana.sock

#################################### Database ############################
[database]
# You can configure the database connection by specifying type, host, name, user and password
# as separate properties or as on string using the url property.

# Either "mysql", "postgres" or "sqlite3", it's your choice
type = sqlite3
host = 127.0.0.1:3306
name = grafana
user = root
# If the password contains # or ; you have to wrap it with triple quotes. Ex """#password;"""
password =
# Use either URL or the previous fields to configure the database
# Example: mysql://user:secret@host:port/database
url =

# Max idle conn setting default is 2
max_idle_conn = 2

# Max conn setting default is 0 (mean not set)
max_open_conn =

# Connection Max Lifetime default is 14400 (means 14400 seconds or 4 hours)
conn_max_lifetime = 14400

# Set to true to log the sql calls and execution times.
log_queries =

# For "postgres", use either "disable", "require" or "verify-full"
# For "mysql", use either "true", "false", or "skip-verify".
ssl_mode = disable

ca_cert_path =
client_key_path =
client_cert_path =
server_cert_name =

# For "sqlite3" only, path relative to data_path setting
path = grafana.db

# For "sqlite3" only. cache mode setting used for connecting to the database
cache_mode = private

#################################### Cache server #############################
[remote_cache]
# Either "redis", "memcached" or "database" default is "database"
type = database

# cache connectionstring options
# database: will use Grafana primary database.
# redis: config like redis server e.g. `addr=127.0.0.1:6379,pool_size=100,db=grafana`
# memcache: 127.0.0.1:11211
connstr =

#################################### Data proxy ###########################
[dataproxy]

# This enables data proxy logging, default is false
logging = false

# How long the data proxy should wait before timing out default is 30 (seconds)
timeout = 30

# If enabled and user is not anonymous, data proxy will add X-Grafana-User header with username into the request, default is false.
send_user_header = false

#################################### Analytics ###########################
[analytics]
# Server reporting, sends usage counters to stats.grafana.org every 24 hours.
# No ip addresses are being tracked, only simple counters to track
# running instances, dashboard and error counts. It is very helpful to us.
# Change this option to false to disable reporting.
reporting_enabled = true

# Set to false to disable all checks to https://grafana.com
# for new versions (grafana itself and plugins), check is used
# in some UI views to notify that grafana or plugin update exists
# This option does not cause any auto updates, nor send any information
# only a GET request to https://grafana.com to get latest versions
check_for_updates = true

# Google Analytics universal tracking code, only enabled if you specify an id here
google_analytics_ua_id =

# Google Tag Manager ID, only enabled if you specify an id here
google_tag_manager_id =

#################################### Security ############################
[security]
# default admin user, created on startup
admin_user = admin

# default admin password, can be changed before first start of grafana, or in profile settings
admin_password = nms@aspider

# used for signing
secret_key = SW2YcwTIb9zpOOhoPsMm

# disable gravatar profile images
disable_gravatar = false

# data source proxy whitelist (ip_or_domain:port separated by spaces)
data_source_proxy_whitelist =

# disable protection against brute force login attempts
disable_brute_force_login_protection = false

# set to true if you host Grafana behind HTTPS. default is false.
cookie_secure = false

# set cookie SameSite attribute. defaults to `lax`. can be set to "lax", "strict" and "none"
cookie_samesite = lax

# set to true if you want to allow browsers to render Grafana in a <frame>, <iframe>, <embed> or <object>. default is false.
allow_embedding = false

#################################### Snapshots ###########################
[snapshots]
# snapshot sharing options
external_enabled = true
external_snapshot_url = https://snapshots-origin.raintank.io
external_snapshot_name = Publish to snapshot.raintank.io

# remove expired snapshot
snapshot_remove_expired = true

#################################### Dashboards ##################

[dashboards]
# Number dashboard versions to keep (per dashboard). Default: 20, Minimum: 1
versions_to_keep = 20

#################################### Users ###############################
[users]
# disable user signup / registration
allow_sign_up = false

# Allow non admin users to create organizations
allow_org_create = false

# Set to true to automatically assign new users to the default organization (id 1)
auto_assign_org = true

# Set this value to automatically add new users to the provided organization (if auto_assign_org above is set to true)
auto_assign_org_id = 1

# Default role new users will be automatically assigned (if auto_assign_org above is set to true)
auto_assign_org_role = Viewer

# Require email validation before sign up completes
verify_email_enabled = false

# Background text for the user field on the login page
login_hint = email or username
password_hint = password

# Default UI theme ("dark" or "light")
default_theme = dark

# External user management
external_manage_link_url =
external_manage_link_name =
external_manage_info =

# Viewers can edit/inspect dashboard settings in the browser. But not save the dashboard.
viewers_can_edit = false

# Editors can administrate dashboard, folders and teams they create
editors_can_admin = false

[auth]
# Login cookie name
login_cookie_name = grafana_session

# The lifetime (days) an authenticated user can be inactive before being required to login at next visit. Default is 7 days.
login_maximum_inactive_lifetime_days = 365

# The maximum lifetime (days) an authenticated user can be logged in since login time before being required to login. Default is 30 days.
login_maximum_lifetime_days = 365

# How often should auth tokens be rotated for authenticated users when being active. The default is each 10 minutes.
token_rotation_interval_minutes = 10

# Set to true to disable (hide) the login form, useful if you use OAuth
disable_login_form = false

# Set to true to disable the signout link in the side menu. useful if you use auth.proxy
disable_signout_menu = false

# URL to redirect the user to after sign out
signout_redirect_url =

# Set to true to attempt login with OAuth automatically, skipping the login screen.
# This setting is ignored if multiple OAuth providers are configured.
oauth_auto_login = false

#################################### Anonymous Auth ######################
[auth.anonymous]
# enable anonymous access
enabled = false

# specify organization name that should be used for unauthenticated users
org_name = Main Org.

# specify role for unauthenticated users
org_role = Viewer

#################################### Github Auth #########################
[auth.github]
enabled = false
allow_sign_up = true
client_id = some_id
client_secret = some_secret
scopes = user:email,read:org
auth_url = https://github.com/login/oauth/authorize
token_url = https://github.com/login/oauth/access_token
api_url = https://api.github.com/user
team_ids =
allowed_organizations =

#################################### GitLab Auth #########################
[auth.gitlab]
enabled = false
allow_sign_up = true
client_id = some_id
client_secret = some_secret
scopes = api
auth_url = https://gitlab.com/oauth/authorize
token_url = https://gitlab.com/oauth/token
api_url = https://gitlab.com/api/v4
allowed_groups =

#################################### Google Auth #########################
[auth.google]
enabled = false
allow_sign_up = true
client_id = some_client_id
client_secret = some_client_secret
scopes = https://www.googleapis.com/auth/userinfo.profile https://www.googleapis.com/auth/userinfo.email
auth_url = https://accounts.google.com/o/oauth2/auth
token_url = https://accounts.google.com/o/oauth2/token
api_url = https://www.googleapis.com/oauth2/v1/userinfo
allowed_domains =
hosted_domain =

#################################### Grafana.com Auth ####################
# legacy key names (so they work in env variables)
[auth.grafananet]
enabled = false
allow_sign_up = true
client_id = some_id
client_secret = some_secret
scopes = user:email
allowed_organizations =

[auth.grafana_com]
enabled = false
allow_sign_up = true
client_id = some_id
client_secret = some_secret
scopes = user:email
allowed_organizations =

#################################### Generic OAuth #######################
[auth.generic_oauth]
name = OAuth
enabled = false
allow_sign_up = true
client_id = some_id
client_secret = some_secret
scopes = user:email
email_attribute_name = email:primary
auth_url =
token_url =
api_url =
team_ids =
allowed_organizations =
tls_skip_verify_insecure = false
tls_client_cert =
tls_client_key =
tls_client_ca =
send_client_credentials_via_post = false

#################################### Basic Auth ##########################
[auth.basic]
enabled = true

#################################### Auth Proxy ##########################
[auth.proxy]
enabled = false
header_name = X-WEBAUTH-USER
header_property = username
auto_sign_up = true
ldap_sync_ttl = 60
whitelist =
headers =

#################################### Auth LDAP ###########################
[auth.ldap]
enabled = false
config_file = /etc/grafana/ldap.toml
allow_sign_up = true

# LDAP backround sync (Enterprise only)
sync_cron = @hourly
active_sync_enabled = false

#################################### SMTP / Emailing #####################
[smtp]
enabled = true
;host = 10.192.128.98:25
host = am1-sha-grafana-p:25
;user = "svc_nms_mail"
# If the password contains # or ; you have to wrap it with triple quotes. Ex """#password;"""
;password = """Bln1yssti"""
;cert_file =
;key_file =
;skip_verify = false
from_address = "grafana@korewireless.com"
from_name = Grafana
;ehlo_identity =

[emails]
;welcome_email_on_sign_up = false
;templates_pattern = emails/*.html

#################################### Logging ##########################
[log]
# Either "console", "file", "syslog". Default is console and file
# Use space to separate multiple modes, e.g. "console file"
mode = console file

# Either "debug", "info", "warn", "error", "critical", default is "info"
level = critical

# optional settings to set different levels for specific loggers. Ex filters = sqlstore:debug
filters =

# For "console" mode only
[log.console]
level =

# log line format, valid options are text, console and json
format = console

# For "file" mode only
[log.file]
level =

# log line format, valid options are text, console and json
format = text

# This enables automated log rotate(switch of following options), default is true
log_rotate = true

# Max line number of single file, default is 1000000
max_lines = 1000000

# Max size shift of single file, default is 28 means 1 << 28, 256MB
max_size_shift = 28

# Segment log daily, default is true
daily_rotate = true

# Expired days of log file(delete after max days), default is 7
max_days = 7

[log.syslog]
level =

# log line format, valid options are text, console and json
format = text

# Syslog network type and address. This can be udp, tcp, or unix. If left blank, the default unix endpoints will be used.
network =
address =

# Syslog facility. user, daemon and local0 through local7 are valid.
facility =

# Syslog tag. By default, the process' argv[0] is used.
tag =

#################################### Usage Quotas ########################
[quota]
enabled = false

#### set quotas to -1 to make unlimited. ####
# limit number of users per Org.
org_user = 10

# limit number of dashboards per Org.
org_dashboard = 100

# limit number of data_sources per Org.
org_data_source = 10

# limit number of api_keys per Org.
org_api_key = 10

# limit number of orgs a user can create.
user_org = 10

# Global limit of users.
global_user = -1

# global limit of orgs.
global_org = -1

# global limit of dashboards
global_dashboard = -1

# global limit of api_keys
global_api_key = -1

# global limit on number of logged in users.
global_session = -1

#################################### Alerting ############################
[alerting]
# Disable alerting engine & UI features
enabled = true
# Makes it possible to turn off alert rule execution but alerting UI is visible
execute_alerts = true

# Default setting for new alert rules. Defaults to categorize error and timeouts as alerting. (alerting, keep_state)
error_or_timeout = alerting

# Default setting for how Grafana handles nodata or null values in alerting. (alerting, no_data, keep_state, ok)
nodata_or_nullvalues = no_data

# Alert notifications can include images, but rendering many images at the same time can overload the server
# This limit will protect the server from render overloading and make sure notifications are sent out quickly
concurrent_render_limit = 5

# Default setting for alert calculation timeout. Default value is 30
evaluation_timeout_seconds = 30

# Default setting for alert notification timeout. Default value is 30
notification_timeout_seconds = 30

# Default setting for max attempts to sending alert notifications. Default value is 3
max_attempts = 3


#################################### Explore #############################
[explore]
# Enable the Explore section
enabled = true

#################################### Internal Grafana Metrics ############
# Metrics available at HTTP API Url /metrics
[metrics]
enabled           = true
interval_seconds  = 10

#If both are set, basic auth will be required for the metrics endpoint.
basic_auth_username =
basic_auth_password =

# Send internal Grafana metrics to graphite
[metrics.graphite]
# Enable by setting the address setting (ex localhost:2003)
address =
prefix = prod.grafana.%(instance_name)s.

[grafana_net]
url = https://grafana.com

[grafana_com]
url = https://grafana.com

#################################### Distributed tracing ############
[tracing.jaeger]
# jaeger destination (ex localhost:6831)
address =
# tag that will always be included in when creating new spans. ex (tag1:value1,tag2:value2)
always_included_tag =
# Type specifies the type of the sampler: const, probabilistic, rateLimiting, or remote
sampler_type = const
# jaeger samplerconfig param
# for "const" sampler, 0 or 1 for always false/true respectively
# for "probabilistic" sampler, a probability between 0 and 1
# for "rateLimiting" sampler, the number of spans per second
# for "remote" sampler, param is the same as for "probabilistic"
# and indicates the initial sampling rate before the actual one
# is received from the mothership
sampler_param = 1

#################################### External Image Storage ##############
[external_image_storage]
# You can choose between (s3, webdav, gcs, azure_blob, local)
provider =

[external_image_storage.s3]
bucket_url =
bucket =
region =
path =
access_key =
secret_key =

[external_image_storage.webdav]
url =
username =
password =
public_url =

[external_image_storage.gcs]
key_file =
bucket =
path =

[external_image_storage.azure_blob]
account_name =
account_key =
container_name =

[external_image_storage.local]
# does not require any configuration

[rendering]
# Options to configure external image rendering server like https://github.com/grafana/grafana-image-renderer
server_url =
callback_url =

[panels]
# here for to support old env variables, can remove after a few months
enable_alpha = false
disable_sanitize_html = true

[plugins]
enable_alpha = false
app_tls_skip_verify_insecure = false

[enterprise]
license_path =

Rgds,
Matthew