Hello I am just curious if the checking of the connection string in qemu_driver.c from libvirt-0.6.1 in qemudDomainMigratePrepare2 is faulty. The source is: [...] } else { /* Check the URI starts with "tcp:". We will escape the * URI when passing it to the qemu monitor, so bad * characters in hostname part don't matter. */ if (!STREQLEN (uri_in, "tcp:", 6)) { qemudReportError (dconn, NULL, NULL, VIR_ERR_INVALID_ARG, "%s", _("only tcp URIs are supported for KVM migrations")); goto cleanup; } [...] The second compare-string "tcp:" is only 4 characters long, therefore a check via strncmp must fail i presumed, i isolated this comparison: #include <stdio.h> #include <string.h> #define STREQLEN(a,b,n) (strncmp((a),(b),(n)) == 0) int main () { char str[][200] = { "tcp://192.168.1.14:4444" , "tcp:192.168.1.14:4444" , "ssh ://192.168.1.14:4444" , "ssh:192.168.1.14:4444" }; int n; for (n=0 ; n<4 ; n++) { printf("testing %s against \"tcp:\" with result: ", str[n]); if (!STREQLEN(str[n],"tcp:",6)) { printf ("ERROR\n"); } else { printf ("OK\n"); } } return 0; } and as i pressumed this gives me on the commandline: testing tcp://192.168.1.14:4444 against "tcp:" with result: ERROR testing tcp:192.168.1.14:4444 against "tcp:" with result: ERROR testing ssh://192.168.1.14:4444 against "tcp:" with result: ERROR testing ssh:192.168.1.14:4444 against "tcp:" with result: ERROR if i change the 6 to 4 it gives testing tcp://192.168.1.14:4444 against "tcp:" with result: OK testing tcp:192.168.1.14:4444 against "tcp:" with result: OK testing ssh://192.168.1.14:4444 against "tcp:" with result: ERROR testing ssh:192.168.1.14:4444 against "tcp:" with result: ERROR but now tcp:// also is marked as correct. Am i missing something here and the checking in qemu_driver.c is correct? I always get the "only tcp URIs are supported for KVM migrations" if i try to migrate KVM-domains in virt-manager 0.7.0 and therefore searched for the root-cause of this problem. Kind regards, Gerrit Slomma Mit freundlichen Grüßen, Gerrit Slomma Team eBetrieb Deutsche Rentenversicherung Bund Abt. 11 - Organisation und IT-Services Fachbereich 1170 - IT-Services und Betrieb Bereich 1174 - Anwendungsbetrieb Team 1174-46 - Trustcenter, eBetrieb