Lync Phone Edition can't retrieve autodiscover.xml

Our Aastra and LG-Nortel Lync phones can't connect to EWS. Digging around in the clg2 logfile from the Aastra, I found that this is because it can't download autodiscover.xml.
The autodiscover url is found through the SRV record:
INFO :: NAutoDiscover::DnsAutodiscoverTask::PopulateAutodiscoverUrlsFromDnsSrv: DNS SRV for email domain, mysipdomain.nl, SRV record, _autodiscover._tcp.sipdomain.nl, succeeded.
INFO :: NAutoDiscover::DnsAutodiscoverTask::PopulateAutodiscoverUrlsFromDnsSrv: SRV record found for record, _autodiscover._tcp.sipdomain.nl, value, autodiscover.mydomain.nl.
INFO :: NAutoDiscover::DnsAutodiscoverTask::TryAutodiscoverUrls: Trying url, https://autodiscover.mydomain.nl/autodiscover/autodiscover.xml
But after this, for some reason, the process throws an error saying that the server is not trusted, resulting in the phone not being able to connect to EWS:
INFO :: DoesDomainMatchServer: DoesDomainMatchServer-no match(sipdomain.nl, autodiscover.mydomain.nl)
INFO :: DoesDomainMatchServer: DoesDomainMatchServer-no match(outlook.com, autodiscover.mydomain.nl)
INFO :: DoesDomainMatchServer: DoesDomainMatchServer-no match(lync.com, autodiscover.mydomain.nl)INFO  :: DoesDomainMatchServer: DoesDomainMatchServer, ret=1, (mydomain.nl, autodiscover.mydomain.nl)
INFO :: NAutoDiscover::DnsAutodiscoverTask::TryAutodiscoverUrls: Server is autodiscover.mydomain.nl not trusted, hr=0x0.
WARN :: NAutoDiscover::DnsAutodiscoverTask::PerformAutodiscovery: DNS autodiscover failed
ERROR :: NAutoDiscover::AutodiscoverTaskBase::OnExecution: Autodiscovery failed. hr=0x80004005.
Resulting in the phone not being able to connect to EWS. As far as I know the certificate is not the issue, because this would generate a specific error starting with "NAutoDiscover::DnsAutodiscoverTask::TryAutodiscoverUrls: Exception with this
url"
What could be the reason for the server not being trusted?

I have that line in my log too, and I've changed my autodiscover URL to use an FQDN from the AD domain, but autodiscover is still not being trusted.
UCD_LOG_INFO: 01/29/2014|12:53:24 Aries: 01/29/2014|12:53:24.659 5530002:51E0026 INFO :: NAutoDiscover::DnsAutodiscoverTask::PopulateAutodiscoverUrlsFromDnsSrv: DNS SRV for email domain, xyztr.com, SRV record, _autodiscover._tcp.xyztr.com, suc 55 43 44 5F 4C 4F 47 5F 49 4E 46 4F 3A 20 30 31 2F 32 39 2F 32 30 31 34 7C 31 32 3A 35 33 3A 32 34 20 41 72 69 65 73 3A 20 30 31 2F 32 39 2F 32 30 31 34 7C 31 32 3A 35 33 3A 32 34 2E 36 35 39 20 35 35 33 30 30 30 32 3A 35 31 45 30 30 32 36 20 49 4E 46 4F 20 20 3A 3A 20 4E 41 75 74 6F 44 69 73 63 6F 76 65 72 3A 3A 44 6E 73 41 75 74 6F 64 69 73 63 6F 76 65 72 54 61 73 6B 3A 3A 50 6F 70 75 6C 61 74 65 41 75 74 6F 64 69 73 63 6F 76 65 72 55 72 6C 73 46 72 6F 6D 44 6E 73 53 72 76 3A 20 44 4E 53 20 53 52 56 20 66 6F 72 20 65 6D 61 69 6C 20 64 6F 6D 61 69 6E 2C 20 6D 6F 6E 74 70 65 6C 69 65 72 74 72 2E 63 6F 6D 2C 20 53 52 56 20 72 65 63 6F 72 64 2C 20 5F 61 75 74 6F 64 69 73 63 6F 76 65 72 2E 5F 74 63 70 2E 6D 6F 6E 74 70 65 6C 69 65 72 74 72 2E 63 6F 6D 2C 20 73 75 63 63 65
UCD_LOG_INFO: 01/29/2014|12:53:24 Aries: 01/29/2014|12:53:24.659 5530002:51E0026 INFO :: NAutoDiscover::DnsAutodiscoverTask::PopulateAutodiscoverUrlsFromDnsSrv: SRV record found for record, _autodiscover._tcp.xyztr.com, value, autodiscover.xyz 55 43 44 5F 4C 4F 47 5F 49 4E 46 4F 3A 20 30 31 2F 32 39 2F 32 30 31 34 7C 31 32 3A 35 33 3A 32 34 20 41 72 69 65 73 3A 20 30 31 2F 32 39 2F 32 30 31 34 7C 31 32 3A 35 33 3A 32 34 2E 36 35 39 20 35 35 33 30 30 30 32 3A 35 31 45 30 30 32 36 20 49 4E 46 4F 20 20 3A 3A 20 4E 41 75 74 6F 44 69 73 63 6F 76 65 72 3A 3A 44 6E 73 41 75 74 6F 64 69 73 63 6F 76 65 72 54 61 73 6B 3A 3A 50 6F 70 75 6C 61 74 65 41 75 74 6F 64 69 73 63 6F 76 65 72 55 72 6C 73 46 72 6F 6D 44 6E 73 53 72 76 3A 20 53 52 56 20 72 65 63 6F 72 64 20 66 6F 75 6E 64 20 66 6F 72 20 72 65 63 6F 72 64 2C 20 5F 61 75 74 6F 64 69 73 63 6F 76 65 72 2E 5F 74 63 70 2E 6D 6F 6E 74 70 65 6C 69 65 72 74 72 2E 63 6F 6D 2C 20 76 61 6C 75 65 2C 20 61 75 74 6F 64 69 73 63 6F 76 65 72 2E 6D 6F 6E 74 70 65 6C 69 65 72 72 65
UCD_LOG_INFO: 01/29/2014|12:53:24 Aries: 01/29/2014|12:53:24.660 5530002:51E0026 INFO :: NAutoDiscover::DnsAutodiscoverTask::TryAutodiscoverUrls: Trying url, https://autodiscover.xyzre.net/autodiscover/autodiscover.xml
UCD_LOG_INFO: 01/29/2014|12:53:24 Aries: 01/29/2014|12:53:24.661 5530002:51E0026 INFO :: DoesDomainMatchServer: DoesDomainMatchServer, ret=0, (xyztr.com, autodiscover.xyzre.net)
UCD_LOG_INFO: 01/29/2014|12:53:24 Aries: 01/29/2014|12:53:24.661 5530002:51E0026 INFO :: DoesDomainMatchServer: DoesDomainMatchServer-no match(outlook.com, autodiscover.xyzre.net)
UCD_LOG_INFO: 01/29/2014|12:53:24 Aries: 01/29/2014|12:53:24.662 5530002:51E0026 INFO :: DoesDomainMatchServer: DoesDomainMatchServer-no match(lync.com, autodiscover.xyzre.net)
UCD_LOG_INFO: 01/29/2014|12:53:24 Aries: 01/29/2014|12:53:24.662 5530002:51E0026 INFO :: DoesDomainMatchServer: DoesDomainMatchServer, ret=1, (xyzre.net, autodiscover.xyzre.net)
UCD_LOG_INFO: 01/29/2014|12:53:24 Aries: 01/29/2014|12:53:24.662 5530002:51E0026 INFO :: NAutoDiscover::DnsAutodiscoverTask::TryAutodiscoverUrls: Server is autodiscover.xyzre.net not trusted, hr=0x0.
UCD_LOG_WARN: 01/29/2014|12:53:24 Aries: 01/29/2014|12:53:24.665 5530002:51E0026 WARN :: NAutoDiscover::DnsAutodiscoverTask::PerformAutodiscovery: DNS autodiscover failed
UCD_LOG_ERROR: 01/29/2014|12:53:24 Aries: 01/29/2014|12:53:24.666 5530002:51E0026 ERROR :: NAutoDiscover::AutodiscoverTaskBase::OnExecution: Autodiscovery failed. hr=0x80004005.
Does anybody know what the return codes for DoesDomainMatchServer() mean?  Should I be getting a 1 for this?

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