Unable to add slave node to SolusVM Master Panel: Cannot connect, Please check your connection settings

Symptoms 

• The following error occurs on attempt to add SolusVM Slave to the Master server:

  SVM_ERROR: Cannot connect, Please check your connection settings

Cause

Old or incorrect SolusVM master IP address is specified in /usr/local/solusvm/data/allow.dat file on the slave node.

Resolution

Note: make sure that SolusVM Master version matches the version of SolusVM on the slave servers.

1. Connect to slave node via SSH and remove the file:

   # rm -f /usr/local/solusvm/data/allow.dat

2. Restart web service:

   # service lighttpd restart && service svmstack-nginx restart

3. Use the data from /usr/local/solusvm/data/solusvm.conf to connect Slave Server to master node at SolusVM > Nodes > Add Node