Error Publishing Complex Web Maps with Many Feature Service Layers

Problem

Many utility customers use large web maps that contain a high number of layers and subtype group layers, particularly within utility networks. Additionally, the map configuration, e.g., the use of CIM symbols, can increase complexity.

When publishing complex web maps from ArcGIS Pro to Portal for ArcGIS, the following error may occur:

Status: Failed    ErrorMessage: Failed to add web item

Cause

This issue is a known Esri limitation:

 BUG-000174210: Unable sharing of large web maps with many feature service layers particularly in utility networks.

Workaround

Tested with ArcGIS Pro 3.5.x and ArcGIS Enterprise 11.5.

An adjustment to the server.xml configuration is required so that Portal for ArcGIS can accommodate larger payload sizes when sharing complex web maps:

1. Navigate on the server where the portal is installed to the directory C:\Program Files\ArcGIS\Portal\framework\runtime\tomcat\conf\ and open the file server.xml
2. Find the parameter maxPostSize in two locations and increase the value. In a known case, the parameter was adjusted from 10 MB (10485760 bytes) to 50 MB (52428800 bytes).
3. Restart all portal services after making the adjustment.

Publishing the web map should now work without errors.