Question posted in 
I have setup Ambari 2.7.0 on Centos 7 server with Mysql 5.7.29 as backend.
All services are running fine, but when I try to login using admin:admin credential it seems to hang and shows following logs in ambari-server.log file:
2020-03-18 06:55:28,031 INFO [MessageBroker-1] WebSocketMessageBrokerStats:113 - WebSocketSession[0 current WS(0)-HttpStream(0)-HttpPoll(0), 0 total, 0 closed abnormally (0 connect failure, 0 send limit, 0 transport error)], stompSubProtocol[processed CONNECT(0)-CONNECTED(0)-DISCONNECT(0)], stompBrokerRelay[null], inboundChannel[pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0], outboundChannelpool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0], sockJsScheduler[pool size = 1, active threads = 1, queued tasks = 0, completed tasks = 0]
2020-03-18 06:55:28,678 INFO [MessageBroker-1] WebSocketMessageBrokerStats:113 - WebSocketSession[0 current WS(0)-HttpStream(0)-HttpPoll(0), 0 total, 0 closed abnormally (0 connect failure, 0 send limit, 0 transport error)], stompSubProtocol[processed CONNECT(0)-CONNECTED(0)-DISCONNECT(0)], stompBrokerRelay[null], inboundChannel[pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0], outboundChannelpool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0], sockJsScheduler[pool size = 1, active threads = 1, queued tasks = 0, completed tasks = 0]
Interesting thing is, moment I enter invalid user or wrong password for admin user, it throws correct error Invalid credentials but on entering correct credentials, its hanging and logs above mentioned logs in ambari-server.log file.
Previously I used to see following logs in MySQL Log file:
[Note] Aborted connection 4 to db: '' user: '' host: '' (Got an error reading communication packets)
As suggested on some questions, I increased max_connections to 400 and max_allowed_packet close to 2% of RAM available on server to 656MB.
After increasing above mentioned configs, I dont see any Error reading communication packets in MySQL log file but I dont seem to get Ambari login working.
When I turn logging level for Ambari-Server to debug and enter random user it gives logs :
2020-03-18 11:24:16,116 DEBUG [ambari-client-thread-47] FilterChainProxy:325 - /api/v1/users/esrdf?fields=*,privileges/PrivilegeInfo/cluster_name,privileges/PrivilegeInfo/permission_name&_=1599955834198 at position 1 of 13 in additional filter chain; firing Filter: 'WebAsyncManagerIntegrationFilter'
But when I enter correct credentials admin:admin, I dont see any API even being called within Logs. What could be the reason for this?
I tried debugging this using API calls, eg: /api/v1/clusters.
When I make the API call from the server itself, it gives correct response but when the API is made from local, it gives out Recv failure: Connection was reset
Can someone point me, where I could be going wrong?
Help Appreciated!
2
Answers
Found the issue. It was a VPN connectivity issue that was preventing login, Ambari UI could be accessed but not login. Login works when connected to a machine on same network.
So basically what may be happening is that once you deploy to service all your paths are a little off, so lets say you have link that says home it will work on local but will not work on server because your application URL is now host:8080/appName/ and when you refer to anything with /home instead of taking you to host:8080/appName/home it will take you to host:8080/home, at which point its a broken url.