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Hi @gganis,
thanks a lot for the rebased PR :-)

I gave it try by running a server and client built with this PR and setting XrdSecGSICREATEPROXY=0 and I run into a double-free error, here's the output from asan:

[simonm@idefix XrdCl]$ ./xrdfs slc7-test ls /tmp
=================================================================
==32039==ERROR: AddressSanitizer: attempting double-free on 0x616000015080 in thread T1:
    #0 0x7fbd64749508 in __interceptor_free (/lib64/libasan.so.4+0xde508)
    #1 0x7fbd62791246 in _IO_new_fclose (/lib64/libc.so.6+0x6e246)
    #2 0x7fbd64748b80 in __interceptor_fclose (/lib64/libasan.so.4+0xddb80)
    #3 0x7fbd63602641 in XrdCryptosslX509ParseFile(char const*, XrdCryptoX509Chain*, char const*) /home/simonm/xrootd-pr1561/src/XrdCrypto/XrdCryptosslAux.cc:469
    #4 0x7fbd58769af0 in XrdSecProtocolgsi::QueryProxy(bool, XrdSutCache*, char const*, XrdCryptoFactory*, long, ProxyIn_t*, ProxyOut_t*) /home/simonm/xrootd-pr1561/src/XrdSecgsi/XrdSecProtocolgsi.cc:5126
    #5 0x7fbd5878be69 in XrdSecProtocolgsi::ClientDoInit(XrdSutBuffer*, XrdSutBuffer**, XrdOucString&) /home/simonm/xrootd-pr1561/src/XrdSecgsi/XrdSecProtocolgsi.cc:3075
    #6 0x7fbd5878c70d in XrdSecProtocolgsi::ParseClientInput(XrdSutBuffer*, XrdSutBuffer**, XrdOucString&) /home/simonm/xrootd-pr1561/src/XrdSecgsi/XrdSecProtocolgsi.cc:2942
    #7 0x7fbd5878d1e1 in XrdSecProtocolgsi::getCredentials(XrdSecBuffer*, XrdOucErrInfo*) /home/simonm/xrootd-pr1561/src/XrdSecgsi/XrdSecProtocolgsi.cc:1507
    #8 0x7fbd6401efa4 in XrdCl::XRootDTransport::GetCredentials(XrdSecBuffer*&, XrdCl::HandShakeData*, XrdCl::XRootDChannelInfo*) /home/simonm/xrootd-pr1561/src/XrdCl/XrdClXRootDTransport.cc:2506
    #9 0x7fbd64029d12 in XrdCl::XRootDTransport::DoAuthentication(XrdCl::HandShakeData*, XrdCl::XRootDChannelInfo*) /home/simonm/xrootd-pr1561/src/XrdCl/XrdClXRootDTransport.cc:2259
    #10 0x7fbd6402eb8b in XrdCl::XRootDTransport::HandShakeMain(XrdCl::HandShakeData*, XrdCl::AnyObject&) /home/simonm/xrootd-pr1561/src/XrdCl/XrdClXRootDTransport.cc:516
    #11 0x7fbd6402fc69 in XrdCl::XRootDTransport::HandShake(XrdCl::HandShakeData*, XrdCl::AnyObject&) /home/simonm/xrootd-pr1561/src/XrdCl/XrdClXRootDTransport.cc:416
    #12 0x7fbd6422b2f5 in XrdCl::AsyncSocketHandler::HandleHandShake(std::unique_ptr<XrdCl::Message, std::default_delete<XrdCl::Message> >) /home/simonm/xrootd-pr1561/src/XrdCl/XrdClAsyncSocketHandler.cc:539
    #13 0x7fbd6422d38c in XrdCl::AsyncSocketHandler::OnReadWhileHandshaking() /home/simonm/xrootd-pr1561/src/XrdCl/XrdClAsyncSocketHandler.cc:527
    #14 0x7fbd642333fc in XrdCl::AsyncSocketHandler::Event(unsigned char, XrdCl::Socket*) /home/simonm/xrootd-pr1561/src/XrdCl/XrdClAsyncSocketHandler.cc:227
    #15 0x7fbd63fc510d in Event /home/simonm/xrootd-pr1561/src/XrdCl/XrdClPollerBuiltIn.cc:83
    #16 0x7fbd635cc497 in XrdSys::IOEvents::Poller::CbkXeq(XrdSys::IOEvents::Channel*, int, int, char const*) /home/simonm/xrootd-pr1561/src/XrdSys/XrdSysIOEvents.cc:695
    #17 0x7fbd635d00ec in XrdSys::IOEvents::PollE::Dispatch(XrdSys::IOEvents::Channel*, unsigned int) /home/simonm/xrootd-pr1561/src/./XrdSys/XrdSysIOEventsPollE.icc:277
    #18 0x7fbd635d06a6 in XrdSys::IOEvents::PollE::Begin(XrdSysSemaphore*, int&, char const**) /home/simonm/xrootd-pr1561/src/./XrdSys/XrdSysIOEventsPollE.icc:232
    #19 0x7fbd635c608f in XrdSys::IOEvents::BootStrap::Start(void*) /home/simonm/xrootd-pr1561/src/XrdSys/XrdSysIOEvents.cc:133
    #20 0x7fbd635dece9 in XrdSysThread_Xeq /home/simonm/xrootd-pr1561/src/XrdSys/XrdSysPthread.cc:86
    #21 0x7fbd62af8ea4 in start_thread (/lib64/libpthread.so.0+0x7ea4)
    #22 0x7fbd62821b0c in clone (/lib64/libc.so.6+0xfeb0c)

0x616000015080 is located 0 bytes inside of 568-byte region [0x616000015080,0x6160000152b8)
freed by thread T1 here:
==32039==AddressSanitizer CHECK failed: ../../../../libsanitizer/asan/asan_descriptions.cc:174 "((id)) != (0)" (0x0, 0x0)
    #0 0x7fbd64754952  (/lib64/libasan.so.4+0xe9952)
    #1 0x7fbd647732e5 in __sanitizer::CheckFailed(char const*, int, char const*, unsigned long long, unsigned long long) (/lib64/libasan.so.4+0x1082e5)
    #2 0x7fbd6469819c  (/lib64/libasan.so.4+0x2d19c)
    #3 0x7fbd64699603  (/lib64/libasan.so.4+0x2e603)
    #4 0x7fbd6469a2cc  (/lib64/libasan.so.4+0x2f2cc)
    #5 0x7fbd647517db  (/lib64/libasan.so.4+0xe67db)
    #6 0x7fbd647494d2 in __interceptor_free (/lib64/libasan.so.4+0xde4d2)
    #7 0x7fbd62791246 in _IO_new_fclose (/lib64/libc.so.6+0x6e246)
    #8 0x7fbd64748b80 in __interceptor_fclose (/lib64/libasan.so.4+0xddb80)
    #9 0x7fbd63602641 in XrdCryptosslX509ParseFile(char const*, XrdCryptoX509Chain*, char const*) /home/simonm/xrootd-pr1561/src/XrdCrypto/XrdCryptosslAux.cc:469
    #10 0x7fbd58769af0 in XrdSecProtocolgsi::QueryProxy(bool, XrdSutCache*, char const*, XrdCryptoFactory*, long, ProxyIn_t*, ProxyOut_t*) /home/simonm/xrootd-pr1561/src/XrdSecgsi/XrdSecProtocolgsi.cc:5126
    #11 0x7fbd5878be69 in XrdSecProtocolgsi::ClientDoInit(XrdSutBuffer*, XrdSutBuffer**, XrdOucString&) /home/simonm/xrootd-pr1561/src/XrdSecgsi/XrdSecProtocolgsi.cc:3075
    #12 0x7fbd5878c70d in XrdSecProtocolgsi::ParseClientInput(XrdSutBuffer*, XrdSutBuffer**, XrdOucString&) /home/simonm/xrootd-pr1561/src/XrdSecgsi/XrdSecProtocolgsi.cc:2942
    #13 0x7fbd5878d1e1 in XrdSecProtocolgsi::getCredentials(XrdSecBuffer*, XrdOucErrInfo*) /home/simonm/xrootd-pr1561/src/XrdSecgsi/XrdSecProtocolgsi.cc:1507
    #14 0x7fbd6401efa4 in XrdCl::XRootDTransport::GetCredentials(XrdSecBuffer*&, XrdCl::HandShakeData*, XrdCl::XRootDChannelInfo*) /home/simonm/xrootd-pr1561/src/XrdCl/XrdClXRootDTransport.cc:2506
    #15 0x7fbd64029d12 in XrdCl::XRootDTransport::DoAuthentication(XrdCl::HandShakeData*, XrdCl::XRootDChannelInfo*) /home/simonm/xrootd-pr1561/src/XrdCl/XrdClXRootDTransport.cc:2259
    #16 0x7fbd6402eb8b in XrdCl::XRootDTransport::HandShakeMain(XrdCl::HandShakeData*, XrdCl::AnyObject&) /home/simonm/xrootd-pr1561/src/XrdCl/XrdClXRootDTransport.cc:516
    #17 0x7fbd6402fc69 in XrdCl::XRootDTransport::HandShake(XrdCl::HandShakeData*, XrdCl::AnyObject&) /home/simonm/xrootd-pr1561/src/XrdCl/XrdClXRootDTransport.cc:416
    #18 0x7fbd6422b2f5 in XrdCl::AsyncSocketHandler::HandleHandShake(std::unique_ptr<XrdCl::Message, std::default_delete<XrdCl::Message> >) /home/simonm/xrootd-pr1561/src/XrdCl/XrdClAsyncSocketHandler.cc:539
    #19 0x7fbd6422d38c in XrdCl::AsyncSocketHandler::OnReadWhileHandshaking() /home/simonm/xrootd-pr1561/src/XrdCl/XrdClAsyncSocketHandler.cc:527
    #20 0x7fbd642333fc in XrdCl::AsyncSocketHandler::Event(unsigned char, XrdCl::Socket*) /home/simonm/xrootd-pr1561/src/XrdCl/XrdClAsyncSocketHandler.cc:227
    #21 0x7fbd63fc510d in Event /home/simonm/xrootd-pr1561/src/XrdCl/XrdClPollerBuiltIn.cc:83
    #22 0x7fbd635cc497 in XrdSys::IOEvents::Poller::CbkXeq(XrdSys::IOEvents::Channel*, int, int, char const*) /home/simonm/xrootd-pr1561/src/XrdSys/XrdSysIOEvents.cc:695
    #23 0x7fbd635d00ec in XrdSys::IOEvents::PollE::Dispatch(XrdSys::IOEvents::Channel*, unsigned int) /home/simonm/xrootd-pr1561/src/./XrdSys/XrdSysIOEventsPollE.icc:277
    #24 0x7fbd635d06a6 in XrdSys::IOEvents::PollE::Begin(XrdSysSemaphore*, int&, char const**) /home/simonm/xrootd-pr1561/src/./XrdSys/XrdSysIOEventsPollE.icc:232
    #25 0x7fbd635c608f in XrdSys::IOEvents::BootStrap::Start(void*) /home/simonm/xrootd-pr1561/src/XrdSys/XrdSysIOEvents.cc:133
    #26 0x7fbd635dece9 in XrdSysThread_Xeq /home/simonm/xrootd-pr1561/src/XrdSys/XrdSysPthread.cc:86
    #27 0x7fbd62af8ea4 in start_thread (/lib64/libpthread.so.0+0x7ea4)
    #28 0x7fbd62821b0c in clone (/lib64/libc.so.6+0xfeb0c)

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