Connection Tunnel could not be Established
Error Message
Maximum Retry Limit Reached![Tunnel failed, got: 503]
Meaning
The adapter could not establish the path to the ERP service. The tunnel request returned a service-unavailable response, and the attempt reached its retry limit.
The message does not confirm that eCMS itself is unavailable; an intermediate service may be affected.
Possible Causes
- A proxy, gateway, or another service on the connection path may be temporarily unavailable.
- Maintenance or high service load may be affecting the connection.
- A temporary network interruption may have prevented the connection from completing.
Recommended Resolution
Ask your ERP administrator or your IT team whether there is a known service or network outage.
After a known outage ends, wait for Textura to retry.
If the error continues, contact Textura Support to identify which part of the connection is affected.
Involve your IT team if the affected service is managed by your organization.
Caution: Do not bypass a proxy, disable a firewall, or change connection settings to work around this error.
Last Published Friday, October 23, 2026