vCenter Server 5.5 becomes inaccessible:

• vSphere Client cannot connect
• Web access fails with SSL error
• Error in browser:

ERR_SSL_VERSION_OR_CIPHER_MISMATCH

• vSphere Client error:

Unable to connect to remote server

vCenter 5.5 uses legacy SSL/TLS and internal certificates that expire.

When system date is beyond certificate validity (e.g., year 2026):

• Certificates are considered invalid
• vmware-vpxd fails to initialize
• Tomcat service does not start

Check service status:

service vmware-vpxd status

Expected faulty output:

vmware-vpxd is running
tomcat is stopped

Check system date:

date

Example problematic output:

Tue Apr 7 2026

Check logs:

less /var/log/vmware/vpxd/vpxd.log

Look for:

Failed to initialize VMware VirtualCenter. Shutting down...

Set system date to a valid range (before certificate expiration):

date 040712002024

Verify:

date

Restart vCenter services:

service vmware-vpxd restart
service vmware-vsphere-client restart

Check vpxd:

service vmware-vpxd status

Expected:

vmware-vpxd is running

Check Tomcat:

service vmware-vsphere-client status

Expected:

running

View logs with pagination:

less /var/log/vmware/vpxd/vpxd.log

Search inside logs:

/error

Exit:

q

Real-time monitoring:

tail -f /var/log/vmware/vpxd/vpxd.log

Search for errors:

grep -i error /var/log/vmware/vpxd/vpxd.log

Tomcat logs:

less /var/log/vmware/vpx/tomcat/logs/catalina.out

• This is a temporary workaround
• Root issue is expired certificates + legacy TLS
• Modern browsers will not support vCenter 5.5 SSL

• Export all VMs from datastore
• Plan migration to modern platform (vCenter 7+ or Proxmox)
• Avoid production dependency on vCenter 5.5

vcenter 5.5, certificate expired, vmware-vpxd failure, tomcat stopped, ssl mismatch, legacy tls

Generated by 3AV - ASH · Antonio Perez