Some SOAP requests to bugs.debian.org (but not all) hang. This happens
with apt-listbugs, e.g. on:

! CONNECT TO bugs.debian.org:80
! CONNECTION ESTABLISHED
POST /cgi-bin/soap.cgi HTTP/1.1
Content-Type: text/xml; charset=utf-8
SOAPAction: ""
User-Agent: SOAP4R/1.6.1-SNAPSHOT (2.3.3, ruby 2.1.5 (2014-11-13))
Accept: */*
Date: Mon, 25 May 2015 09:01:29 GMT
Content-Length: 1264
Host: bugs.debian.org

<?xml version="1.0" encoding="utf-8" ?>
<env:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:env="http://schemas.xmlsoap.org/soap/envelope/">
  <env:Body>
    <n1:get_bugs env:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
        xmlns:n1="Debbugs/SOAP/">
      <keyvalue xmlns:n2="http://schemas.xmlsoap.org/soap/encoding/"
          n2:arrayType="xsd:anyType[4]"
          xsi:type="n2:Array">
        <item xsi:type="xsd:string">severity</item>
        <item n2:arrayType="xsd:anyType[7]"
            xsi:type="n2:Array">
          <item xsi:type="xsd:string">critical</item>
          <item xsi:type="xsd:string">grave</item>
          <item xsi:type="xsd:string">serious</item>
          <item xsi:type="xsd:string">important</item>
          <item xsi:type="xsd:string">normal</item>
          <item xsi:type="xsd:string">minor</item>
          <item xsi:type="xsd:string">wishlist</item>
        </item>
        <item xsi:type="xsd:string">package</item>
        <item n2:arrayType="xsd:anyType[1]"
            xsi:type="n2:Array">
          <item xsi:type="xsd:string">iucode-tool</item>
        </item>
      </keyvalue>
    </n1:get_bugs>
  </env:Body>
</env:Envelope>

but also when I've tried to report this problem with reportbug,
which hangs at:

Querying Debian BTS for reports on bugs.debian.org (source)...

(I had to use the --no-query-bts option).