Hi @Kurakula, Julia
This problem is a relatively common problem in WCF and the solution is as follows:
<bindings>
<basicHttpBinding>
<binding name="basicHttp" allowCookies="true"
maxReceivedMessageSize="20000000"
maxBufferSize="20000000"
maxBufferPoolSize="20000000">
<readerQuotas maxDepth="32"
maxArrayLength="200000000"
maxStringContentLength="200000000"/>
</binding>
</basicHttpBinding>
</bindings>
To prevent DOS-type attacks, adjust the value to 20000000.
Best Regards
Qi You