Customer today came to us with this problem. System was dropping calls after a tomcat restart.
They said that they were planning to move from IPs to FQDN for the servers to eliminate Jabber clients getting errors for the IP address not being trusted.
They have certs deployed properly with the FQDN in the CN field, and FQDN, DNS, IP as SANs across the board
Before they began, the servers, (CUCM-> Servers) showed they two IPs
| Host Name/IP Address | Description | Server Type |
|---|---|---|
| 192.168.1.24 | CUC_IMP | CUCM IM and Presence |
| 192.168.1.20 | CUC_M | CUCM Voice/Video |
System version: 10.5.2.12901-1
CUCM:
admin:show network eth0
Ethernet 0
DHCP : disabled Status : up
IP Address : 192.168.1.20 IP Mask : 255.255.255.000
Link Detected: yes Mode : Auto disabled, Full, 10000 Mbits/s
Duplicate IP : no
DNS
Not configured.
CIMP:
admin:show network eth0
Ethernet 0
DHCP : disabled Status : up
IP Address : 192.168.1.24 IP Mask : 255.255.255.000
Link Detected: yes Mode : Auto disabled, Full, 1000 Mbits/s
Duplicate IP : no
DNS
Not configured.
They used the CLI to configure a DNS server for the CUCM;
set network dns primary 192.168.1.30
admin:show network eth0
Ethernet 0
DHCP : disabled Status : up
IP Address : 192.168.1.20 IP Mask : 255.255.255.000
Link Detected: yes Mode : Auto disabled, Full, 10000 Mbits/s
Duplicate IP : no
DNS
Primary : 192.168.1.30 Secondary : Not Configured
Options : timeout:5 attempts:2
Domain : Not configured
Gateway : 10.5.14.2 on Ethernet 0
and then changed the IP for the FQDN in the servers section for the CIMP server and calls started dropping. A reboot of CUCM and everything came back online except connectivity between the CUCM and the CIMP
CUCM shows this;
admin:run sql select name,description,nodeid from processnode
name description nodeid
========================= ================== ======
EnterpriseWideData 1
192.168.1.20 CUCM - Publisher 2
cimp.domain.tld CUCIMP - Publisher 3
CIMP shows this;
admin:run sql select name,description,nodeid from processnode
name description nodeid
================== ================== ======
EnterpriseWideData 1
192.168.1.20 CUCM - Publisher 2
cimp CUCIMP - Publisher 3
CUCM:
admin:show network cluster
192.168.1.20 cucm Publisher callmanager DBPub authenticated
192.168.1.24 cimp Subscriber cups DBPub authenticated using TCP since Fri Apr 27 15:46:47 2018
Server Table (processnode) Entries
----------------------------------
192.168.1.20
cimp.domain.tld
CIMP
admin:show network cluster
192.168.1.24 cimp Subscriber cups DBPub authenticated
192.168.1.20 cucm Publisher callmanager DBPub authenticated using TCP since Fri Apr 27 15:47:02 2018
Not sure what to try at this point
Navigating to serviceability on the CUCM and selecting cimp.domain.tld results in
Connection to the Server cannot be established (Unable to access Remote Node)
