We do have 3 Servers. On all servers is ISP Config running. One Server is the main server, the others are the slave. one of the slaves is virtulized with 5 instanzes, also managed by ISPConfig. After Updating to Debian9 and PHP updating are now several problems.
1. changings from the main server are not going to be submitted to the slave server
2. There are no instanzes starting on the virtual machine. one virtual server is zammad runnning
3. alot of spam messages are arrivning by email