Alright, I had a look at this with GDB on an Alma9 container. It seems that the call to `XrdNetUtils::Match` below returns false:
```
#0 XrdNetUtils::Match (HostName=HostName@entry=0x48ff6a "man1.xrootd", HostPat=HostPat@entry=0x4903c0 "man1+") at /usr/src/debug/xrootd-v5.5.5.350-1.el9.x86_64/xrootd/src/XrdNet/XrdNetUtils.cc:645
#1 0x00007ffff7e1f7c3 in XrdOucUtils::doIf (eDest=0x447eb0 <XrdGlobal::Log>, Config=..., what=what@entry=0x7ffff7e71c1f "if directive", hname=0x48ff6a "man1.xrootd", nname=0x48ff65 "anon", pname=0x48ff60 "cmsd") at /usr/src/debug/xrootd-v5.5.5.350-1.el9.x86_64/xrootd/src/XrdOuc/XrdOucUtils.cc:245
#2 0x00007ffff7e1a043 in XrdOucStream::doif (this=this@entry=0x7fffffffe230) at /usr/src/debug/xrootd-v5.5.5.350-1.el9.x86_64/xrootd/src/XrdOuc/XrdOucStream.cc:1294
#3 0x00007ffff7e1a2c2 in XrdOucStream::doelse (this=this@entry=0x7fffffffe230) at /usr/src/debug/xrootd-v5.5.5.350-1.el9.x86_64/xrootd/src/XrdOuc/XrdOucStream.cc:1244
#4 0x00007ffff7e1b210 in XrdOucStream::GetMyFirstWord (this=this@entry=0x7fffffffe230, lowcase=lowcase@entry=0) at /usr/src/debug/xrootd-v5.5.5.350-1.el9.x86_64/xrootd/src/XrdOuc/XrdOucStream.cc:724
#5 0x000000000040fc7c in XrdConfig::ConfigProc (this=0x448680 <XrdMain::Config>) at /usr/src/debug/xrootd-v5.5.5.350-1.el9.x86_64/xrootd/src/Xrd/XrdConfig.cc:894
#6 0x00000000004107a4 in XrdConfig::Configure (this=this@entry=0x448680 <XrdMain::Config>, argc=argc@entry=3, argv=argv@entry=0x7fffffffeb88) at /usr/src/debug/xrootd-v5.5.5.350-1.el9.x86_64/xrootd/src/Xrd/XrdConfig.cc:666
#7 0x000000000040a24c in main (argc=3, argv=0x7fffffffeb88) at /usr/src/debug/xrootd-v5.5.5.350-1.el9.x86_64/xrootd/src/Xrd/XrdMain.cc:181
```
This is because at the snippet below:
https://github.com/xrootd/xrootd/blob/master/src/XrdNet/XrdNetUtils.cc#L644-L653
The call to `XrdNetAddr::Set("man1", 5, 16, 0)` has a problem with `getaddrinfo` when called below
https://github.com/xrootd/xrootd/blob/master/src/XrdNet/XrdNetAddr.cc#L371-L378
as the returned info has a null pointer for the hostname. Then `InetAddr[i].Name()` returns `nullptr` in line 651.
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