Thanks. That seemed to do the trick - it is now working as expected. 
For the record, the change made was - 

changed web_endpoint_uri = http://graylog-web01:12900/  to 
https://graylog:12900 (the load balancer) in effect making both web 
interface and rest api use https 

Regards, 

On Thursday, October 13, 2016 at 2:23:37 AM UTC-4, Jochen Schalanda wrote:
>
> Hi,
>
> you're running into a problem with the Mixed Content Policy of your web 
> browser.
>
> If you're using HTTPS for the web interface, you also have to use HTTPS 
> for the Graylog REST API (see web_endpoint_uri 
> <https://github.com/Graylog2/graylog2-server/blob/2.1.1/misc/graylog.conf#L137-L139>
> ).
>
> In general, please refer to 
> http://docs.graylog.org/en/2.1/pages/configuration/web_interface.html and 
> http://docs.graylog.org/en/2.1/pages/configuration/https.html for more 
> information.
>
> Cheers,
> Jochen
>
> On Wednesday, 12 October 2016 19:28:48 UTC+2, fxp wrote:
>>
>> Env: Graylog 2.1.1, JRE 1.8.0, ES 2.4.1, RHEL 6.8
>>
>> *setup* - 2 x graylog-servers v2.1.1 with 1 x load balancer in front 
>> running nginx v1.10
>>
>> Load balancer setup not using ssl (just http) works well without issue. 
>> However the moment I enable ssl/termination on nginx, I keep running into 
>> Server Currently Unavailable Error. I've poured over the graylog 
>> documentation and I'm unable to find out what is wrong. 
>> Does someone have working example of SSL load balancer in front of 
>> graylog production setup (either with SSL termination on lb or SSL Pass 
>> through?). User --> https --> LB --> http or https --> graylog cluster (2 
>> nodes)
>> Can someone pls assist and guide where the issue is??? 
>>
>>
>> *Graylog-server configs :*
>>
>> node1 -
>>
>> is_master = true
>>> node_id_file = /etc/graylog/server/node-id
>>> password_secret = xxxx 
>>> root_password_sha2 = xxxx
>>> root_timezone = US/Eastern
>>> plugin_dir = /usr/share/graylog-server/plugin
>>> rest_listen_uri = http://graylog-web01:12900/
>>> rest_transport_uri = http://graylog-web01:12900/
>>> web_listen_uri = http://graylog-web01:9000/
>>> web_endpoint_uri = http://graylog-web01:12900/
>>> rotation_strategy = count
>>> elasticsearch_max_docs_per_index = 20000000
>>> elasticsearch_max_number_of_indices = 40
>>> retention_strategy = delete
>>> elasticsearch_shards = 8
>>> elasticsearch_replicas = 1
>>> elasticsearch_index_prefix = graylog2
>>> allow_leading_wildcard_searches = false
>>> allow_highlighting = false
>>> elasticsearch_cluster_name = graylog2
>>> elasticsearch_node_name_prefix = graylog-web01-
>>> elasticsearch_discovery_zen_ping_multicast_enabled = false
>>> elasticsearch_discovery_zen_ping_unicast_hosts = 10.30.20.58:9300, 
>>> 10.30.20.59:9300, 10.30.20.65:9300
>>> elasticsearch_network_host = graylog-web01
>>> elasticsearch_analyzer = standard
>>> output_batch_size = 500
>>> output_flush_interval = 1
>>> output_fault_count_threshold = 5
>>> output_fault_penalty_seconds = 30
>>> processbuffer_processors = 5
>>> outputbuffer_processors = 3
>>> processor_wait_strategy = blocking
>>> ring_size = 65536
>>> inputbuffer_ring_size = 65536
>>> inputbuffer_processors = 2
>>> inputbuffer_wait_strategy = blocking
>>> message_journal_enabled = true
>>> message_journal_dir = /var/lib/graylog-server/journal
>>> lb_recognition_period_seconds = 3
>>> lb_throttle_threshold_percentage = 95
>>> mongodb_uri = 
>>> mongodb://user:password@graylog-web01,graylog-web02/graylog2?replicaSet=graylog2Repl
>>> mongodb_max_connections = 1000
>>> mongodb_threads_allowed_to_block_multiplier = 5
>>> content_packs_dir = /usr/share/graylog-server/contentpacks
>>> content_packs_auto_load = grok-patterns.json
>>> proxied_requests_thread_pool_size = 32
>>>
>>
>> node2 -
>>
>>> is_master = false 
>>> node_id_file = /etc/graylog/server/node-id
>>> password_secret = xxxx
>>> root_password_sha2 = xxxx
>>> root_timezone = US/Eastern
>>> plugin_dir = /usr/share/graylog-server/plugin
>>> rest_listen_uri = http://graylog-web02:12900/
>>> rest_transport_uri = http://graylog-web02:12900/
>>> web_listen_uri = http://graylog-web02:9000/
>>> web_endpoint_uri = http://graylog-web02:12900/
>>> rotation_strategy = count
>>> elasticsearch_max_docs_per_index = 20000000
>>> elasticsearch_max_number_of_indices = 40
>>> retention_strategy = delete
>>> elasticsearch_shards = 8
>>> elasticsearch_replicas = 1
>>> elasticsearch_index_prefix = graylog2
>>> allow_leading_wildcard_searches = false
>>> allow_highlighting = false
>>> elasticsearch_cluster_name = graylog2
>>> elasticsearch_node_name_prefix = graylog-web02-
>>> elasticsearch_discovery_zen_ping_multicast_enabled = false
>>> elasticsearch_discovery_zen_ping_unicast_hosts = 10.30.20.58:9300, 
>>> 10.30.20.59:9300, 10.30.20.65:9300
>>> elasticsearch_network_host = graylog-web02
>>> elasticsearch_analyzer = standard
>>> output_batch_size = 500
>>> output_flush_interval = 1
>>> output_fault_count_threshold = 5
>>> output_fault_penalty_seconds = 30
>>> processbuffer_processors = 5
>>> outputbuffer_processors = 3
>>> processor_wait_strategy = blocking
>>> ring_size = 65536
>>> inputbuffer_ring_size = 65536
>>> inputbuffer_processors = 2
>>> inputbuffer_wait_strategy = blocking
>>> message_journal_enabled = true
>>> message_journal_dir = /var/lib/graylog-server/journal
>>> lb_recognition_period_seconds = 3
>>> lb_throttle_threshold_percentage = 95
>>> mongodb_uri = 
>>> mongodb://user:password@graylog-web01,graylog-web02/graylog2?replicaSet=graylog2Repl
>>> mongodb_max_connections = 1000
>>> mongodb_threads_allowed_to_block_multiplier = 5
>>> content_packs_dir = /usr/share/graylog-server/contentpacks
>>> content_packs_auto_load = grok-patterns.json
>>> proxied_requests_thread_pool_size = 32
>>>
>>  
>>
>> *nginx load balancer config : *
>>
>>
>> upstream graylog-weblb {
>>>     server graylog-web01:9000;
>>>     server graylog-web02:9000;
>>> }
>>> upstream graylog-apilb {
>>>     server graylog-web01:12900;
>>>     server graylog-web02:12900;
>>> }
>>> server {
>>>     listen 80;
>>>     return 301 https://$host$request_uri;
>>> }
>>> server {
>>>     listen 443 ssl;
>>>     server_name graylog;
>>>     ssl on;
>>>     ssl_certificate    /etc/nginx/ssl/graylog/server.crt;
>>>     ssl_certificate_key    /etc/nginx/ssl/graylog/server.key;
>>>     ssl_session_cache shared:SSL:20m;
>>>     ssl_session_timeout 10m;
>>>     ssl_prefer_server_ciphers       on;
>>>     ssl_protocols                   TLSv1 TLSv1.1 TLSv1.2;
>>>     ssl_ciphers                     
>>> ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5:!DSS;
>>>     add_header Strict-Transport-Security "max-age=31536000";
>>>     access_log            /var/log/nginx/graylog.access.log;
>>>     location / {
>>>       proxy_set_header        Host $host;
>>>       proxy_set_header        X-Real-IP $remote_addr;
>>>       proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
>>>       proxy_set_header        X-Forwarded-Proto $scheme;
>>>       proxy_read_timeout  90;
>>>       proxy_pass          http://graylog-weblb;
>>>     }    
>>> }
>>> server {
>>>     listen 12900 ssl;
>>>     server_name graylog;
>>>     ssl on;
>>>     ssl_certificate    /etc/nginx/ssl/graylog/server.crt;
>>>     ssl_certificate_key    /etc/nginx/ssl/graylog/server.key;
>>>     ssl_session_cache shared:SSL:20m;
>>>     ssl_session_timeout 10m;
>>>     ssl_prefer_server_ciphers       on;
>>>     ssl_protocols                   TLSv1 TLSv1.1 TLSv1.2;
>>>     ssl_ciphers                     
>>> ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5:!DSS;
>>>     add_header Strict-Transport-Security "max-age=31536000";
>>>     access_log            /var/log/nginx/graylog-api.access.log;
>>>     location / {
>>>       proxy_set_header        Host $host;
>>>       proxy_set_header        X-Real-IP $remote_addr;
>>>       proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
>>>       proxy_set_header        X-Forwarded-Proto $scheme;
>>>       proxy_read_timeout  90;
>>>       proxy_pass          http://graylog-apilb;
>>>     }
>>> }
>>>
>>>
>>
>> *Error seen - *
>> Server Currently unavailable 
>> We are experiencing problems connecting to Graylog server running on 
>> http://graylog-web02:12900/. Please verify the server is healthy and 
>> working correctly. 
>>
>> Error messageBad requestOriginal RequestGET 
>> http://graylog-web02:12900/system/sessionsStatus codeundefinedFull error 
>> messageError: Request has been terminated Possible causes: the network 
>> is offline, Origin is not allowed by Access-Control-Allow-Origin, the page 
>> is being unloaded, etc.
>> Many Many thanks, 
>>
>

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