Strange threading error message with all web service requests

I am attempting to create sales orders through a .NET web service object using JSON. I can successfully create an order in X3 with the web service test utility built in to X3 by using save method and the JSON string that is generated by my application, so I know I don't have an issue with data content or formatting. However, when I attempt to use the save method through my .NET web service reference, I receive a very strange exception message back from X3:

**Exception** - Class[CCommException]
Can't start the thread that process the request [20171031155329.41] (WJSSOH:OBJET).
--Stack--
com.adonix.x3.comm.client.adonix.pool.CPoolEntry.buildCantStartExecutor(CPoolEntry.java:348)
com.adonix.x3.comm.client.adonix.pool.CPoolEntry.launchRequest(CPoolEntry.java:834)
com.adonix.x3.comm.client.adonix.pool.CPoolThreadDistributor.launchRequest(CPoolThreadDistributor.java:611)
com.adonix.x3.comm.client.adonix.pool.CPoolThreadDistributor.launchRequest(CPoolThreadDistributor.java:564)
com.adonix.x3.comm.client.adonix.pool.CPoolThreadDistributor.run(CPoolThreadDistributor.java:754)
java.lang.Thread.run(Unknown Source)
**Cause** - Class[CCommException]
can't execute the soap request, please use syracuse soap web-service
--Stack--
com.adonix.x3.comm.client.adonix.pool.CPoolRequestSpgm.buildAckCalls(CPoolRequestSpgm.java:137)
com.adonix.x3.comm.client.adonix.pool.CPoolRequestSpgm.getAckCalls(CPoolRequestSpgm.java:219)
com.adonix.x3.comm.client.adonix.pool.CPoolThreadExecutor.runExecutor(CPoolThreadExecutor.java:152)
com.adonix.x3.comm.client.adonix.pool.CPoolEntry.launchRequest(CPoolEntry.java:828)
com.adonix.x3.comm.client.adonix.pool.CPoolThreadDistributor.launchRequest(CPoolThreadDistributor.java:611)
com.adonix.x3.comm.client.adonix.pool.CPoolThreadDistributor.launchRequest(CPoolThreadDistributor.java:564)
com.adonix.x3.comm.client.adonix.pool.CPoolThreadDistributor.run(CPoolThreadDistributor.java:754)
java.lang.Thread.run(Unknown Source)

I'm using the same .NET application to integrate sales orders with several other separate installations of X3 in different environments, so I'm 90% sure this is an issue with the way web services have been set up in this particular scenario. I have tried making different calls to several other web services in this environment as well, and they all return the same sort of error. The SOH web service in this example has been named SSOH.

Can anyone help me decipher this stack trace? I've been working on this for a week on my own and have tried everything I can think of.

Thanks in advance!