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Unrestricted String is Empty – Error in CUCM Installation

Unrestricted String is Empty – Error in CUCM Installation

Recently i was working on a migration of CUCM from 8.X to 10.X using PCD and i faced an error as “Unrestricted String is Empty” and i had to restart with the installation again and again. I did the installation thrice assuming that the error may wipe out and it will proceed further but no luck. Below is how i resolved the issue.

  1. Logged into 8.X Cisco Unified Communication Manager and verified Database Replication which was broken. I fixed the replication issue first.
  2. Deleted the OVA and re-deployed the OVA.
  3. Deleted the task and discovery information from PCD.
  4. Rediscovered 8.X Cluster and created a task again. Started with the migration and it went successful.

Hope this helps!!

Published by Team UC Collabing

2 thoughts on “Unrestricted String is Empty – Error in CUCM Installation”

  1. KT says:

    Did you have to reboot Publisher .?

    1. Administrator
      Administrator says:

      No, in my case publisher reboot was not required. If still you are unable to proceed without rebooting the Publisher, try to reboot it off business hours.

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Electrical Engineer CCNA Collaboration CCNA Voice CCNA R&S. I'm Electrical Engineer and I work like Support Engineer for a Telephony Service Provider Company. Before that I had position like Pre-Sale Engineer about small and medium multivendor telephony solutions. I have 5 years of experience working in Telephony Multivendor Projects. I am also 3 years of experience working in Support and implementation about Cisco Collaboration platforms: UCS server, UCM, Cisco Unity, Presence Server, Jabber, Gateway. Support Community is most useful in finding design, implementation and support tricks and shortcuts that greatly help me in my daily activities. If you need to contact me, please you can writte me.


CCNA Routing and Switching
Am a technology enthusiast. I work in network support providing support with implementation, maintaining and precisely troubleshooting the infra.
Realm of collaboration makes me want to learn and face new challenges more and more.