diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 30241e732..eb4be973a 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -7,6 +7,7 @@ This file contains a high-level description of this package's evolution. Release
 
 ## 4.8.0 - TBD
 
+* [Bug Fixes] Make fillmismatch the default for DAP2 and DAP4; too many servers ignore this requirement.
 * [Bug Fixes] Fix some memory leaks in NCZarr, fix a bug with long strides in NCZarr. See [Github #1913](https://github.com/Unidata/netcdf-c/pull/1913) for more information.
 * [Enhancement] Add some optimizations to NCZarr, dosome cleanup of code cruft, add some NCZarr test cases, add a performance test to NCZarr. See [Github #1908](https://github.com/Unidata/netcdf-c/pull/1908) for more information.
 * [Bug Fix] Implement a better chunk cache system for NCZarr. The cache now uses extendible hashing plus a linked list for provide a combination of expandibility, fast access, and LRU behavior. See [Github #1887](https://github.com/Unidata/netcdf-c/pull/1887) for more information.
diff --git a/include/ncdap.h b/include/ncdap.h
index bb49a8472..ebb977e11 100644
--- a/include/ncdap.h
+++ b/include/ncdap.h
@@ -43,7 +43,7 @@ typedef unsigned int NCFLAGS;
 #define NCF_COLUMBIA        (0x80000000) /* Hack for columbia server */
 
 /* Define all the default on flags */
-#define DFALT_ON_FLAGS (NCF_CACHE|NCF_PREFETCH)
+#define DFALT_ON_FLAGS (NCF_CACHE|NCF_PREFETCH|NCF_FILLMISMATCH)
 
 typedef struct NCCONTROLS {
     NCFLAGS  flags;
diff --git a/libdap2/ncd2dispatch.c b/libdap2/ncd2dispatch.c
index c1dd51af5..dca2f3d69 100644
--- a/libdap2/ncd2dispatch.c
+++ b/libdap2/ncd2dispatch.c
@@ -824,13 +824,13 @@ fprintf(stderr,"\n");
 			if(val) free(val);
 			nclistpush(unsignedatt->values,strdup("false"));
 		    } else if(att->etype != var->etype) {/* other mismatches */
-			/* Log a message */
-	                nclog(NCLOGWARN,"_FillValue/Variable type mismatch: variable=%s",var->ncbasename);
 			/* See if mismatch is allowed */
 			if(FLAGSET(dapcomm->controls,NCF_FILLMISMATCH)) {
 			    /* Forcibly change the attribute type to match */
 			    att->etype = var->etype;
 			} else {
+	  		    /* Log a message */
+	                    nclog(NCLOGWARN,"_FillValue/Variable type mismatch: variable=%s",var->ncbasename);
 			    ncstat = NC_EBADTYPE; /* fail */
 			    goto done;
 			}