Hello,
On one of our xrootd (5.1.0) managers, if the cmsd is already running it is quite often seen that the xrootd crashes moments after a restart.
```
(gdb) where
#0 XrdNet::Trim (this=0x0, hname=hname@entry=0x7f8d1db9a5a0 "xcache-redirector.cern.ch")
at /data/dhsmith/xrootd4/xrootd-510-rebuild/src/XrdNet/XrdNet.cc:348
#1 0x00007f8d248df2b2 in XrdLinkCtl::Alloc (peer=..., opts=opts@entry=0)
at /data/dhsmith/xrootd4/xrootd-510-rebuild/src/Xrd/XrdLinkCtl.cc:158
#2 0x00007f8d248ddf81 in XrdInet::Connect (this=0x7f8d1f8a4150, host=<optimized out>, port=1213,
opts=opts@entry=0, tmo=tmo@entry=-1) at /data/dhsmith/xrootd4/xrootd-510-rebuild/src/Xrd/XrdInet.cc:198
#3 0x00007f8d24bd7043 in XrdCmsClientMan::Hookup (this=this@entry=0x7f8d1fb45000)
at /data/dhsmith/xrootd4/xrootd-510-rebuild/src/XrdCms/XrdCmsClientMan.cc:347
#4 0x00007f8d24bd7880 in XrdCmsClientMan::Start (this=0x7f8d1fb45000)
at /data/dhsmith/xrootd4/xrootd-510-rebuild/src/XrdCms/XrdCmsClientMan.cc:230
#5 0x00007f8d248a5947 in XrdSysThread_Xeq (myargs=0x7f8d1f874760)
at /data/dhsmith/xrootd4/xrootd-510-rebuild/src/XrdSys/XrdSysPthread.cc:86
#6 0x00007f8d24451ea5 in start_thread () from /lib64/libpthread.so.0
#7 0x00007f8d237529fd in clone () from /lib64/libc.so.6
```
last few lines in xrootd.log:
```
Config warning: HTTPS functionality was not configured.
210307 16:03:24 29835 sysConfig: XRDROLE: manager
210307 16:03:24 29835 sysConfig: Configured as HTTP(s) redirector.
------ HTTP protocol initialization completed.
------ xrootd [log in to unmask]:1094 initialization completed.
```
Possibly XrdGlobal::XrdNetTCP is not set in time for the XrdCmsStartManager thread.
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