After upgrading to 3.7.5 my data collector is not showing in the data collector list in CAPC
After installing the Data Collector the status shows as Not Connected in the DX NetOps Performance Center Data Collector Status view.
After upgrading the Data Collector the status shows as Not Connected and shows the wrong old version in the DX NetOps Performance Center Data Collector Status view.
While examining the logs the only thing seen is the connection request from Data Collector to Data Aggregator in the Data Collector karaf.log file. It errors out with a time out due to no response.
On the Data Aggregator side we see no indication that it received the connection request.
This can also be observed by seeing failures for the communications from Data Collector to Data Aggregator for openwire protocols in a packet capture.
All supported DX NetOps Performance Management releases
Firewall rules are blocking ports allowing successful communication between Data Collector and Data Aggregator.
There are a few common causes for this problem.
After stopping the firewalld service or resolving the network firewall blocking communications, restart the Data Collector dcmd and activemq services.
Starting the dcmd process will automatically start the activemq process so there should not be a need to start it manually.
Note that if continued connection issues are observed, try restarting the ActiveMQ service on the Data Aggregator. This can be done without stopping and starting the dadaemon service itself, thus avoiding a sync failure outage in Performance Center. When doing this the dadaemon should restart the ActiveMQ service on it's own within a minute or two if it being stopped. If it does not then a dadaemon restart will be required.