Article - CS109594

Error “ptc_d exited with status 28 (­communication error)” reported in the server log file (ptclmgrd.log or ptc_d.log) when starting the service for PTC FlexNet License Server for all PTC FLEX-enabled products

Modified: 12-Oct-2021   

Applies To

  • Creo Illustrate 1.0 to 6.0
  • Creo View 5.1
  • Pro/ENGINEER and Creo Elements/Pro Wildfire to Wildfire 5.0
  • Mathcad 14.0 to 15.0
  • Mathcad Prime 1.0 to 6.0
  • ProductView and Creo Elements/View 9.1
  • Creo Parametric 1.0 to 8.0


  • Error ptc_d exited with status 28 (­communication error) reported in the server log file (ptclmgrd.log or ptc_d.log) when starting service for PTC FlexNet License Server
  • Exiting due to signal 28
  • PTC License Server will not start with error status 28
  • How to avoid frequent licensing errors on application startup?
  • Once a month license server will stop issuing licenses
  • Three network cards have been configured in the computer, but flexnet cannot catch the corresponding network cards
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