How can I solve the "Connection Reset" error?

Hi all,

I'm using a Soap Request Response in a Web Project to invoke a web service.
Recently the invokation stopped working and I found this exception in the log:

07 nov 2017 06:25:02,277 ERROR [_job.scheduler_Worker-1] (com.webratio.units.ws.rtx.SoapRequestResponseUnitService:73) - [WR_JOB_-1942439417][_job.manager][job1][miu52][opm25][rru6]Unable to execute service
com.webratio.rtx.RTXException: An error occurred dispatching the SOAP message
at com.webratio.rtx.ws.SoapMessageDispatcher.dispatch(SoapMessageDispatcher.java:227)
at com.webratio.units.ws.rtx.AbstractRequestResponseUnitService.execute(AbstractRequestResponseUnitService.java:196)
at com.webratio.rtx.core.OperationModuleService._execute(OperationModuleService.java:209)
at com.webratio.rtx.core.OperationModuleService.execute(OperationModuleService.java:133)
at com.webratio.units.module.rtx.ModuleInstanceUnitService.createUnitBean(ModuleInstanceUnitService.java:199)
at com.webratio.units.module.rtx.ModuleInstanceUnitService.getUnitBean(ModuleInstanceUnitService.java:153)
at com.webratio.units.module.rtx.ModuleInstanceUnitService.execute(ModuleInstanceUnitService.java:136)
at com.webratio.rtx.jobs.WRJobExecutor._executeJob(WRJobExecutor.java:204)
at com.webratio.rtx.jobs.WRJobExecutor.doExecuteJob(WRJobExecutor.java:129)
at com.webratio.rtx.jobs.WRJobExecutor.executeJobNewThread(WRJobExecutor.java:82)
at com.webratio.rtx.jobs.QuartzJob.execute(QuartzJob.java:47)
at org.quartz.core.JobRunShell.run(JobRunShell.java:213)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:557)
Caused by: java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:189)
at java.net.SocketInputStream.read(SocketInputStream.java:121)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
at java.io.BufferedInputStream.read(BufferedInputStream.java:254)
at org.apache.commons.httpclient.HttpParser.readRawLine(HttpParser.java:78)
at org.apache.commons.httpclient.HttpParser.readLine(HttpParser.java:106)
at org.apache.commons.httpclient.HttpConnection.readLine(HttpConnection.java:1116)
at org.apache.commons.httpclient.HttpMethodBase.readStatusLine(HttpMethodBase.java:1973)
at org.apache.commons.httpclient.HttpMethodBase.readResponse(HttpMethodBase.java:1735)
at org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java:1098)
at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:398)
at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)
at com.webratio.rtx.ws.SoapMessageDispatcher.dispatch(SoapMessageDispatcher.java:186)
... 12 more

What could be the reason of this error?